diff --git a/source/src/main/java/one/nem/lacerta/source/database/entity/CombineDocumentEntity.java b/source/src/main/java/one/nem/lacerta/source/database/entity/CombineDocumentEntity.java
new file mode 100644
index 00000000..e1b0234d
--- /dev/null
+++ b/source/src/main/java/one/nem/lacerta/source/database/entity/CombineDocumentEntity.java
@@ -0,0 +1,30 @@
+package one.nem.lacerta.source.database.entity;
+
+import androidx.annotation.NonNull;
+import androidx.room.ColumnInfo;
+import androidx.room.Entity;
+import androidx.room.PrimaryKey;
+
+@Entity(tableName = "combine_document")
+public class CombineDocumentEntity {
+
+    @PrimaryKey
+    @ColumnInfo(name = "id")
+    @NonNull
+    public String id; // ドキュメントID
+
+    @ColumnInfo(name = "title")
+    public String title; // タイトル
+
+    @ColumnInfo(name = "created_at")
+    public String createdAt; // 作成日時
+
+    @ColumnInfo(name = "updated_at")
+    public String updatedAt; // 更新日時
+
+    @ColumnInfo(name = "author")
+    public String author; // 作成者
+
+    @ColumnInfo(name = "parent_id")
+    public String parentId; // 親フォルダID
+}