diff --git a/.gitignore b/.gitignore
index 33d78ee..93816da 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,10 @@ api/lib/interface
 api/env/*
 api/seeds/*
 web/prod/*
+api/docs/schemaspy/*
+!api/docs/schemaspy/.gitkeep
+!api/docs/schemaspy/schemaspy.properties
+!api/docs/schemaspy/README.md
+
+# SchemaSpy
+schemaspy/
\ No newline at end of file
diff --git a/Makefile b/Makefile
index c7d2fbb..0f52a0a 100644
--- a/Makefile
+++ b/Makefile
@@ -85,6 +85,16 @@ mac-seed:
 	sleep 15
 	docker compose -f docker-compose.mac.yml run --rm api go run /app/seeds/seeds.go
 
+.PHONY: schemaspy
+schemaspy:
+	mkdir -p api/docs/schemaspy
+	docker compose run --rm schemaspy $(ARGS)
+
+.PHONY: mac-schemaspy
+mac-schemaspy:
+	mkdir -p api/docs/schemaspy
+	docker compose -f docker-compose.mac.yml run --rm schemaspy $(ARGS)
+
 # mobile/lib/assetsに512*512のアイコンを用意しておくこと(コマンドのファイル名も変更する)
 # リサイズ用にImageMagickをインストールする（`sudo apt-get install imagemagick` or `brew install imagemagick`）
 .PHONY: mobile-icons-init
diff --git a/README.md b/README.md
index ea0f535..66d47b3 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,19 @@ git submodule update --init
 ### diを編集してからうまく動かないとき
 一度コンテナをdownさせてからupし直してみてください。
 
+## SchemaSpyでDBスキーマを確認する（PostgreSQL）
+- DB初期データは `mysql/db` ディレクトリにありますが、実際のDBはPostgreSQLです。
+- 生成物の出力先: `api/docs/schemaspy`
+
+```fish
+# 標準（docker-compose.yml）
+make schemaspy
+
+# Mac用composeを使う場合
+make mac-schemaspy
+```
+接続先・認証情報は compose の環境変数（`SCHEMASPY_HOST`, `SCHEMASPY_DB` など）で上書きできます。
+
 ## Author
 NUTMEG（技大祭実行委員会情報局）
 mail: nutfes.info [at] gmail
diff --git a/api/docs/schemaspy/.gitkeep b/api/docs/schemaspy/.gitkeep
new file mode 100644
index 0000000..139597f
--- /dev/null
+++ b/api/docs/schemaspy/.gitkeep
@@ -0,0 +1,2 @@
+
+
diff --git a/api/docs/schemaspy/README.md b/api/docs/schemaspy/README.md
new file mode 100644
index 0000000..93bacec
--- /dev/null
+++ b/api/docs/schemaspy/README.md
@@ -0,0 +1,6 @@
+# SchemaSpy 出力先
+
+- 生成物のHTMLはこのディレクトリに出力されます。
+- 設定テンプレート: `schemaspy.properties`（接続先はPostgreSQLを想定）。
+- `docker compose run --rm schemaspy` または `make schemaspy` で再生成できます。
+
diff --git a/api/docs/schemaspy/schemaspy.properties b/api/docs/schemaspy/schemaspy.properties
new file mode 100644
index 0000000..359a834
--- /dev/null
+++ b/api/docs/schemaspy/schemaspy.properties
@@ -0,0 +1,17 @@
+# SchemaSpy configuration for SeeFT PostgreSQL
+# メモ: リポジトリ内の mysql ディレクトリは初期データ置き場だが、実際のDBはPostgreSQL。
+schemaspy.t=pgsql
+schemaspy.host=${SCHEMASPY_HOST:-db}
+schemaspy.port=${SCHEMASPY_PORT:-5432}
+schemaspy.db=${SCHEMASPY_DB:-seeft_db}
+schemaspy.u=${SCHEMASPY_USER:-seeft}
+schemaspy.p=${SCHEMASPY_PASSWORD:-password}
+schemaspy.s=${SCHEMASPY_SCHEMA:-public}
+
+# 出力先は docker-compose のボリューム指定で /output にマウントされる
+schemaspy.o=/output
+
+# 追加で必要な場合のサンプル
+# schemaspy.meta=/output/meta.xml
+# schemaspy.cat=public
+
diff --git a/docker-compose.mac.yml b/docker-compose.mac.yml
index 01c8f4d..913391c 100644
--- a/docker-compose.mac.yml
+++ b/docker-compose.mac.yml
@@ -43,3 +43,36 @@ services:
     tty: true
     depends_on: [api]
 
+  schemaspy:
+    container_name: nutfes-seeft-schemaspy
+    image: schemaspy/schemaspy:latest
+    depends_on:
+      db:
+        condition: service_started
+    environment:
+      SCHEMASPY_HOST: ${SCHEMASPY_HOST:-db}
+      SCHEMASPY_PORT: ${SCHEMASPY_PORT:-5432}
+      SCHEMASPY_DB: ${SCHEMASPY_DB:-seeft_db}
+      SCHEMASPY_USER: ${SCHEMASPY_USER:-seeft}
+      SCHEMASPY_PASSWORD: ${SCHEMASPY_PASSWORD:-password}
+      SCHEMASPY_SCHEMA: ${SCHEMASPY_SCHEMA:-public}
+    volumes:
+      - ./api/docs/schemaspy:/output
+    command:
+      - "-t"
+      - "pgsql"
+      - "-host"
+      - "${SCHEMASPY_HOST:-db}"
+      - "-port"
+      - "${SCHEMASPY_PORT:-5432}"
+      - "-db"
+      - "${SCHEMASPY_DB:-seeft_db}"
+      - "-u"
+      - "${SCHEMASPY_USER:-seeft}"
+      - "-p"
+      - "${SCHEMASPY_PASSWORD:-password}"
+      - "-s"
+      - "${SCHEMASPY_SCHEMA:-public}"
+      - "-o"
+      - "/output"
+
diff --git a/docker-compose.yml b/docker-compose.yml
index eb60dd3..b28aa43 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -1,4 +1,4 @@
-version: "3.8"
+
 
 services:
   db:
@@ -59,4 +59,39 @@ services:
     tty: true
     depends_on: [api]
 
+  schemaspy:
+    container_name: nutfes-seeft-schemaspy
+    image: schemaspy/schemaspy:latest
+    depends_on:
+      db:
+        condition: service_started
+    environment:
+      SCHEMASPY_HOST: ${SCHEMASPY_HOST:-db}
+      SCHEMASPY_PORT: ${SCHEMASPY_PORT:-5432}
+      SCHEMASPY_DB: ${SCHEMASPY_DB:-seeft_db}
+      SCHEMASPY_USER: ${SCHEMASPY_USER:-seeft}
+      SCHEMASPY_PASSWORD: ${SCHEMASPY_PASSWORD:-password}
+      SCHEMASPY_SCHEMA: ${SCHEMASPY_SCHEMA:-public}
+    volumes:
+      - ./api/docs/schemaspy:/output
+    profiles:
+      - tools
+    command:
+      - "-t"
+      - "pgsql"
+      - "-host"
+      - "${SCHEMASPY_HOST:-db}"
+      - "-port"
+      - "${SCHEMASPY_PORT:-5432}"
+      - "-db"
+      - "${SCHEMASPY_DB:-seeft_db}"
+      - "-u"
+      - "${SCHEMASPY_USER:-seeft}"
+      - "-p"
+      - "${SCHEMASPY_PASSWORD:-password}"
+      - "-s"
+      - "${SCHEMASPY_SCHEMA:-public}"
+      # - "-o"
+      # - "/output"
+