diff --git a/src/main/java/com/nulabinc/backlog4j/BacklogClient.java b/src/main/java/com/nulabinc/backlog4j/BacklogClient.java
index ea0dc58e..a4816718 100644
--- a/src/main/java/com/nulabinc/backlog4j/BacklogClient.java
+++ b/src/main/java/com/nulabinc/backlog4j/BacklogClient.java
@@ -9,7 +9,7 @@
  * @author nulab-inc
  */
 public interface BacklogClient extends ProjectMethods, IssueMethods, SpaceMethods,
-        WikiMethods, ResolutionMethods, StatusMethods, PriorityMethods, UserMethods,
+        WikiMethods, DocumentMethods, ResolutionMethods, StatusMethods, PriorityMethods, UserMethods,
         StarMethods, NotificationMethods, GitMethods, PullRequestMethods, GroupMethods, WebhookMethods, WatchingMethods,
         BacklogUrlSupport {
 
diff --git a/src/main/java/com/nulabinc/backlog4j/BacklogClientImpl.java b/src/main/java/com/nulabinc/backlog4j/BacklogClientImpl.java
index 75cedb37..fd58dfc6 100644
--- a/src/main/java/com/nulabinc/backlog4j/BacklogClientImpl.java
+++ b/src/main/java/com/nulabinc/backlog4j/BacklogClientImpl.java
@@ -1105,4 +1105,22 @@ public void markAsCheckedUserWatches(Object numericUserId) throws BacklogExcepti
         post(buildEndpoint("users/" + numericUserId + "/watchings/markAsChecked"));
     }
 
+    @Override
+    public ResponseList<Document> getDocuments(GetDocumentsParams params) {
+        ResponseList<Document> documents = factory.createDocumentList(get(buildEndpoint("documents"), params));
+        return documents;
+    }
+
+    @Override
+    public Document getDocument(String documentId) {
+        return factory.createDocument(get(buildEndpoint("documents/" + documentId)));
+    }
+
+    @Override
+    public AttachmentData downloadDocumentAttachment(String documentId, long attachmentId) {
+        BacklogHttpResponse backlogHttpResponse = get(backlogEndPointSupport.getDocumentAttachmentEndpoint(documentId, attachmentId));
+        String filename = backlogHttpResponse.getFileNameFromContentDisposition();
+        InputStream inputStream = backlogHttpResponse.asInputStream();
+        return new AttachmentDataImpl(filename, inputStream);
+    }
 }
diff --git a/src/main/java/com/nulabinc/backlog4j/BacklogEndPointSupport.java b/src/main/java/com/nulabinc/backlog4j/BacklogEndPointSupport.java
index 6c2c87d1..312376a7 100644
--- a/src/main/java/com/nulabinc/backlog4j/BacklogEndPointSupport.java
+++ b/src/main/java/com/nulabinc/backlog4j/BacklogEndPointSupport.java
@@ -102,4 +102,16 @@ public String getPullRequestAttachmentEndpoint(Object projectIdOrKey, Object rep
     protected String buildEndpoint(String connection) {
         return configure.getRestBaseURL() + "/" + connection;
     }
+
+    /**
+     * Returns the endpoint of Document page's attachment file.
+     *
+     * @param documentId       the Document page identifier
+     * @param attachmentId the attachment identifier
+     * @return the endpoint
+     * @throws BacklogException
+     */
+    public String getDocumentAttachmentEndpoint(String documentId, long attachmentId) throws BacklogException {
+        return buildEndpoint("documents/" + documentId + "/attachments/" + attachmentId);
+    }
 }
diff --git a/src/main/java/com/nulabinc/backlog4j/Document.java b/src/main/java/com/nulabinc/backlog4j/Document.java
new file mode 100644
index 00000000..baae6cb8
--- /dev/null
+++ b/src/main/java/com/nulabinc/backlog4j/Document.java
@@ -0,0 +1,40 @@
+package com.nulabinc.backlog4j;
+
+import java.util.Date;
+import java.util.List;
+
+/**
+ * The interface for Backlog Document page data.
+ *
+ * @author nulab-inc
+ */
+public interface Document {
+
+    String getId();
+
+    long getProjectId();
+
+    String getProjectIdAsString();
+
+    String getTitle();
+
+    String getJson();
+
+    String getPlain();
+
+    long getStatusId();
+
+    String getEmoji();
+
+    List<DocumentTag> getTags();
+
+    List<Attachment> getAttachments();
+
+    User getCreatedUser();
+
+    Date getCreated();
+
+    User getUpdatedUser();
+
+    Date getUpdated();
+}
diff --git a/src/main/java/com/nulabinc/backlog4j/DocumentTag.java b/src/main/java/com/nulabinc/backlog4j/DocumentTag.java
new file mode 100644
index 00000000..27c0bbd1
--- /dev/null
+++ b/src/main/java/com/nulabinc/backlog4j/DocumentTag.java
@@ -0,0 +1,15 @@
+package com.nulabinc.backlog4j;
+
+/**
+ * The interface for Backlog Document page's tag data.
+ *
+ * @author nulab-inc
+ */
+public interface DocumentTag {
+
+    long getId();
+
+    String getIdAsString();
+
+    String getName();
+}
diff --git a/src/main/java/com/nulabinc/backlog4j/api/DocumentMethods.java b/src/main/java/com/nulabinc/backlog4j/api/DocumentMethods.java
new file mode 100644
index 00000000..ed63e7f5
--- /dev/null
+++ b/src/main/java/com/nulabinc/backlog4j/api/DocumentMethods.java
@@ -0,0 +1,41 @@
+package com.nulabinc.backlog4j.api;
+
+import com.nulabinc.backlog4j.AttachmentData;
+import com.nulabinc.backlog4j.Document;
+import com.nulabinc.backlog4j.ResponseList;
+import com.nulabinc.backlog4j.api.option.GetDocumentsParams;
+
+/**
+ * Executes Backlog Document APIs.
+ *
+ * @author nulab-inc
+ */
+public interface DocumentMethods {
+
+    /**
+     * Returns Document pages in the project.
+     *
+     * @param params the finding document parameters
+     * @return the document pages in a list
+     */
+    ResponseList<Document> getDocuments(GetDocumentsParams params);
+
+
+    /**
+     * Returns the Document page.
+     *
+     * @param documentId the Document page identifier
+     * @return the Document page
+     */
+    Document getDocument(String documentId);
+
+    /**
+     * Downloads the Document page's attachment file.
+     *
+     * @param documentId   the Document page identifier
+     * @param attachmentId the attachment file identifier
+     * @return downloaded file data
+     */
+    AttachmentData downloadDocumentAttachment(String documentId, long attachmentId);
+
+}
diff --git a/src/main/java/com/nulabinc/backlog4j/api/option/GetDocumentsParams.java b/src/main/java/com/nulabinc/backlog4j/api/option/GetDocumentsParams.java
new file mode 100644
index 00000000..fbb37f5b
--- /dev/null
+++ b/src/main/java/com/nulabinc/backlog4j/api/option/GetDocumentsParams.java
@@ -0,0 +1,89 @@
+package com.nulabinc.backlog4j.api.option;
+
+import com.nulabinc.backlog4j.BacklogException;
+import com.nulabinc.backlog4j.http.NameValuePair;
+
+import java.util.List;
+
+/**
+ * Parameters for get document page API.
+ *
+ * @author nulab-inc
+ */
+public class GetDocumentsParams extends GetParams {
+
+    private SortKey sort;
+    private Order order;
+
+    public enum SortKey {
+        Created("created"),
+        Updated("updated");
+
+        SortKey(String value) {
+            this.value = value;
+        }
+
+        public String getStrValue() {
+            return value;
+        }
+
+        private final String value;
+    }
+
+    public enum Order {
+        Asc("asc"),
+        Desc("desc");
+
+        Order(String value) {
+            this.value = value;
+        }
+
+        public String getStrValue() {
+            return value;
+        }
+
+        private final String value;
+    }
+
+    public GetDocumentsParams(List<Long> projectIds, long offset) {
+        parameters.add(new NameValuePair("offset", String.valueOf(offset)));
+        for (Long projectId : projectIds) {
+            parameters.add(new NameValuePair("projectId[]", projectId.toString()));
+        }
+    }
+
+    public GetDocumentsParams keyword(String keyword) throws BacklogException {
+        parameters.add(new NameValuePair("keyword", keyword));
+        return this;
+    }
+
+    public GetDocumentsParams sort(SortKey sort) {
+        parameters.add(new NameValuePair("sort", sort.getStrValue()));
+        this.sort = sort;
+        return this;
+    }
+
+    public GetDocumentsParams order(Order order) {
+        parameters.add(new NameValuePair("order", order.getStrValue()));
+        this.order = order;
+        return this;
+    }
+
+    public GetDocumentsParams offset(long offset) {
+        parameters.add(new NameValuePair("offset", String.valueOf(offset)));
+        return this;
+    }
+
+    public GetDocumentsParams count(long count) {
+        parameters.add(new NameValuePair("count", String.valueOf(count)));
+        return this;
+    }
+
+    public SortKey getSort() {
+        return sort;
+    }
+
+    public Order getOrder() {
+        return order;
+    }
+}
diff --git a/src/main/java/com/nulabinc/backlog4j/internal/InternalFactory.java b/src/main/java/com/nulabinc/backlog4j/internal/InternalFactory.java
index 0c3852b6..33efba5a 100644
--- a/src/main/java/com/nulabinc/backlog4j/internal/InternalFactory.java
+++ b/src/main/java/com/nulabinc/backlog4j/internal/InternalFactory.java
@@ -130,4 +130,8 @@ public interface InternalFactory {
 
     ResponseList<Watch> createWatchList(BacklogHttpResponse res) throws BacklogException;
 
+    ResponseList<Document> createDocumentList(BacklogHttpResponse res) throws BacklogException;
+
+    Document createDocument(BacklogHttpResponse res) throws BacklogException;
+
 }
diff --git a/src/main/java/com/nulabinc/backlog4j/internal/json/DocumentJSONImpl.java b/src/main/java/com/nulabinc/backlog4j/internal/json/DocumentJSONImpl.java
new file mode 100644
index 00000000..27bbfb58
--- /dev/null
+++ b/src/main/java/com/nulabinc/backlog4j/internal/json/DocumentJSONImpl.java
@@ -0,0 +1,179 @@
+package com.nulabinc.backlog4j.internal.json;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.nulabinc.backlog4j.*;
+import org.apache.commons.lang3.builder.EqualsBuilder;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
+import org.apache.commons.lang3.builder.ToStringBuilder;
+
+import java.util.Arrays;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * @author nulab-inc
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class DocumentJSONImpl implements Document {
+
+    private String id;
+    private long projectId;
+    private String title;
+    @JsonDeserialize(using = JacksonCustomJsonDeserializer.class)
+    private String json;
+    private String plain;
+    private long statusId;
+    private String emoji;
+    @JsonDeserialize(as = DocumentTagJSONImpl[].class)
+    private DocumentTag[] tags;
+    @JsonDeserialize(as = AttachmentJSONImpl[].class)
+    private Attachment[] attachments;
+
+    @JsonDeserialize(as = UserJSONImpl.class)
+    private User createdUser;
+    @JsonDeserialize(using = JacksonCustomDateDeserializer.class)
+    private Date created;
+    @JsonDeserialize(as = UserJSONImpl.class)
+    private User updatedUser;
+    @JsonDeserialize(using = JacksonCustomDateDeserializer.class)
+    private Date updated;
+
+    @Override
+    public String getId() {
+        return this.id;
+    }
+
+    @Override
+    public String getTitle() {
+        return this.title;
+    }
+
+    @Override
+    public String getJson() {
+        return this.json;
+    }
+
+    @Override
+    public String getPlain() {
+        return this.plain;
+    }
+
+    @Override
+    public long getStatusId() {
+        return this.statusId;
+    }
+
+    @Override
+    public String getEmoji() {
+        return this.emoji;
+    }
+
+    @Override
+    public List<DocumentTag> getTags() {
+        return Arrays.asList(this.tags);
+    }
+
+    @Override
+    public List<Attachment> getAttachments() {
+        return Arrays.asList(this.attachments);
+    }
+
+    @Override
+    public long getProjectId() {
+        return projectId;
+    }
+
+    @Override
+    public String getProjectIdAsString() {
+        return String.valueOf(this.projectId);
+    }
+
+    @Override
+    public User getCreatedUser() {
+        return createdUser;
+    }
+
+    @Override
+    public Date getCreated() {
+        return created;
+    }
+
+    @Override
+    public User getUpdatedUser() {
+        return updatedUser;
+    }
+
+    @Override
+    public Date getUpdated() {
+        return updated;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (obj == this) {
+            return true;
+        }
+        if (obj.getClass() != getClass()) {
+            return false;
+        }
+        DocumentJSONImpl rhs = (DocumentJSONImpl) obj;
+        return new EqualsBuilder()
+                .append(this.id, rhs.id)
+                .append(this.projectId, rhs.projectId)
+                .append(this.title, rhs.title)
+                .append(this.json, rhs.json)
+                .append(this.plain, rhs.plain)
+                .append(this.statusId, rhs.statusId)
+                .append(this.emoji, rhs.emoji)
+                .append(this.tags, rhs.tags)
+                .append(this.attachments, rhs.attachments)
+                .append(this.createdUser, rhs.createdUser)
+                .append(this.created, rhs.created)
+                .append(this.updatedUser, rhs.updatedUser)
+                .append(this.updated, rhs.updated)
+                .isEquals();
+    }
+
+    @Override
+    public int hashCode() {
+        return new HashCodeBuilder()
+                .append(id)
+                .append(projectId)
+                .append(title)
+                .append(json)
+                .append(plain)
+                .append(statusId)
+                .append(emoji)
+                .append(tags)
+                .append(attachments)
+                .append(createdUser)
+                .append(created)
+                .append(updatedUser)
+                .append(updated)
+                .toHashCode();
+    }
+
+    @Override
+    public String toString() {
+        return new ToStringBuilder(this)
+                .append("id", id)
+                .append("projectId", projectId)
+                .append("title", title)
+                .append("json", json)
+                .append("plain", plain)
+                .append("statusId", statusId)
+                .append("emoji", emoji)
+                .append("tags", tags)
+                .append("attachments", attachments)
+                .append("createdUser", createdUser)
+                .append("created", created)
+                .append("updatedUser", updatedUser)
+                .append("updated", updated)
+                .toString();
+    }
+}
diff --git a/src/main/java/com/nulabinc/backlog4j/internal/json/DocumentTagJSONImpl.java b/src/main/java/com/nulabinc/backlog4j/internal/json/DocumentTagJSONImpl.java
new file mode 100644
index 00000000..5607a654
--- /dev/null
+++ b/src/main/java/com/nulabinc/backlog4j/internal/json/DocumentTagJSONImpl.java
@@ -0,0 +1,67 @@
+package com.nulabinc.backlog4j.internal.json;
+
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import com.nulabinc.backlog4j.DocumentTag;
+import com.nulabinc.backlog4j.WikiTag;
+import org.apache.commons.lang3.builder.EqualsBuilder;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
+import org.apache.commons.lang3.builder.ToStringBuilder;
+
+/**
+ * @author nulab-inc
+ */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class DocumentTagJSONImpl implements DocumentTag {
+
+    private long id;
+    private String name;
+
+    @Override
+    public long getId() {
+        return this.id;
+    }
+
+    @Override
+    public String getIdAsString() {
+        return String.valueOf(this.id);
+    }
+
+    @Override
+    public String getName() {
+        return this.name;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (obj == this) {
+            return true;
+        }
+        if (obj.getClass() != getClass()) {
+            return false;
+        }
+        DocumentTagJSONImpl rhs = (DocumentTagJSONImpl) obj;
+        return new EqualsBuilder()
+                .append(this.id, rhs.id)
+                .append(this.name, rhs.name)
+                .isEquals();
+    }
+
+    @Override
+    public int hashCode() {
+        return new HashCodeBuilder()
+                .append(id)
+                .append(name)
+                .toHashCode();
+    }
+
+    @Override
+    public String toString() {
+        return new ToStringBuilder(this)
+                .append("id", id)
+                .append("name", name)
+                .toString();
+    }
+}
diff --git a/src/main/java/com/nulabinc/backlog4j/internal/json/InternalFactoryJSONImpl.java b/src/main/java/com/nulabinc/backlog4j/internal/json/InternalFactoryJSONImpl.java
index 8b15006b..2c95e178 100644
--- a/src/main/java/com/nulabinc/backlog4j/internal/json/InternalFactoryJSONImpl.java
+++ b/src/main/java/com/nulabinc/backlog4j/internal/json/InternalFactoryJSONImpl.java
@@ -547,6 +547,16 @@ public ResponseList<Watch> createWatchList(BacklogHttpResponse res) throws Backl
         return createObjectList(res.asString(), Watch.class, WatchJSONImpl[].class);
     }
 
+    @Override
+    public ResponseList<Document> createDocumentList(BacklogHttpResponse res) throws BacklogException {
+        return createObjectList(res.asString(), Document.class, DocumentJSONImpl[].class);
+    }
+
+    @Override
+    public Document createDocument(BacklogHttpResponse res) throws BacklogException {
+        return createObject(res.asString(), Document.class, DocumentJSONImpl.class);
+    }
+
     public Watch createWatch(String resStr) throws BacklogException {
         return createObject(resStr, Watch.class, WatchJSONImpl.class);
     }
diff --git a/src/main/java/com/nulabinc/backlog4j/internal/json/JacksonCustomJsonDeserializer.java b/src/main/java/com/nulabinc/backlog4j/internal/json/JacksonCustomJsonDeserializer.java
new file mode 100644
index 00000000..273d501c
--- /dev/null
+++ b/src/main/java/com/nulabinc/backlog4j/internal/json/JacksonCustomJsonDeserializer.java
@@ -0,0 +1,23 @@
+package com.nulabinc.backlog4j.internal.json;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.io.IOException;
+
+/**
+ * @author nulab-inc
+ */
+public class JacksonCustomJsonDeserializer extends JsonDeserializer<String> {
+
+    private static final ObjectMapper mapper = new ObjectMapper();
+
+    @Override
+    public String deserialize(JsonParser parser, DeserializationContext context) throws IOException {
+        return mapper.writeValueAsString(parser.readValueAsTree());
+    }
+}
+
+