diff --git a/src/server/api/endpoints/drive/folders.ts b/src/server/api/endpoints/drive/folders.ts
index a0b972f71..73c179f7b 100644
--- a/src/server/api/endpoints/drive/folders.ts
+++ b/src/server/api/endpoints/drive/folders.ts
@@ -36,7 +36,14 @@ export const meta = {
 			default: null as any,
 			transform: transform,
 		}
-	}
+	},
+
+	res: {
+		type: 'array',
+		items: {
+			type: 'DriveFolder',
+		},
+	},
 };
 
 export default define(meta, async (ps, user) => {
diff --git a/src/server/api/endpoints/drive/folders/find.ts b/src/server/api/endpoints/drive/folders/find.ts
index 17769567a..16b6c1063 100644
--- a/src/server/api/endpoints/drive/folders/find.ts
+++ b/src/server/api/endpoints/drive/folders/find.ts
@@ -23,7 +23,14 @@ export const meta = {
 				'ja-JP': 'フォルダID'
 			}
 		},
-	}
+	},
+
+	res: {
+		type: 'array',
+		items: {
+			type: 'DriveFolder',
+		},
+	},
 };
 
 export default define(meta, async (ps, user) => {
diff --git a/src/server/api/endpoints/drive/folders/show.ts b/src/server/api/endpoints/drive/folders/show.ts
index 033743622..bbfcbed51 100644
--- a/src/server/api/endpoints/drive/folders/show.ts
+++ b/src/server/api/endpoints/drive/folders/show.ts
@@ -29,6 +29,10 @@ export const meta = {
 		}
 	},
 
+	res: {
+		type: 'DriveFolder',
+	},
+
 	errors: {
 		noSuchFolder: {
 			message: 'No such folder.',
diff --git a/src/server/api/openapi/schemas.ts b/src/server/api/openapi/schemas.ts
index 127a7939d..e4b917693 100644
--- a/src/server/api/openapi/schemas.ts
+++ b/src/server/api/openapi/schemas.ts
@@ -278,6 +278,46 @@ export const schemas = {
 		required: ['id', 'createdAt', 'name', 'type', 'datasize', 'md5']
 	},
 
+	DriveFolder: {
+		type: 'object',
+		properties: {
+			id: {
+				type: 'string',
+				format: 'id',
+				description: 'The unique identifier for this Drive folder.',
+				example: 'xxxxxxxxxxxxxxxxxxxxxxxx',
+			},
+			createdAt: {
+				type: 'string',
+				format: 'date-time',
+				description: 'The date that the Drive folder was created.'
+			},
+			name: {
+				type: 'string',
+				description: 'The folder name.',
+			},
+			foldersCount: {
+				type: 'number',
+				description: 'The count of child folders.',
+			},
+			filesCount: {
+				type: 'number',
+				description: 'The count of child files.',
+			},
+			parentId: {
+				type: 'string',
+				format: 'id',
+				nullable: true,
+				description: 'The parent folder ID of this folder.',
+				example: 'xxxxxxxxxxxxxxxxxxxxxxxx',
+			},
+			parent: {
+				type: 'DriveFolder',
+			},
+		},
+		required: ['id', 'createdAt', 'name']
+	},
+
 	Muting: {
 		type: 'object',
 		properties: {