diff --git a/groupAPI.yaml b/groupAPI.yaml
new file mode 100644
index 0000000..8e89b70
--- /dev/null
+++ b/groupAPI.yaml
@@ -0,0 +1,35 @@
+swagger: "2.0"
+info:
+  description: "This is "
+  version: "1.0.0"
+  title: "Petstore API"
+  termsOfService: "http://swagger.io/terms/"
+  contact:
+    email: "apiteam@swagger.io"
+  license:
+    name: "Apache 2.0"
+    url: "http://www.apache.org/licenses/LICENSE-2.0.html"
+paths:
+  /pet/{petId}:
+    get:
+      summary: "ペット情報API"
+      description: "指定されたpetIdの情報を返します"
+      parameters:
+      - name: "petId"
+        in: "path"
+        description: "取得したいペットのID"
+        required: true
+        type: "integer"
+        format: "int64"
+      responses:
+        200:
+          description: "成功時のレスポンス"
+          schema:
+            type: "object"
+            properties:
+              id:
+                type: "integer"
+                format: "int64"
+              name:
+                type: "string"
+                example: "doggie"
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