diff --git a/doc/_toc.yml b/doc/_toc.yml
index 516e6376..7259b037 100644
--- a/doc/_toc.yml
+++ b/doc/_toc.yml
@@ -18,6 +18,7 @@ parts:
       - file: ommx_message/function
       - file: ommx_message/instance
       - file: ommx_message/solution
+      - file: ommx_message/parametric_instance
   - caption: "OMMX Artifact"
     chapters:
       - file: ommx_artifact/architecture
diff --git a/doc/ommx_message/parametric_instance.ipynb b/doc/ommx_message/parametric_instance.ipynb
new file mode 100644
index 00000000..590fdc21
--- /dev/null
+++ b/doc/ommx_message/parametric_instance.ipynb
@@ -0,0 +1,43 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# ommx.v1.ParametricInstance\n",
+    "\n",
+    "[`ommx.v1.ParametricInstance`](https://jij-inc.github.io/ommx/python/ommx/autoapi/ommx/v1/index.html#ommx.v1.ParametricInstance) は決定変数でないパラメータを持つ数理モデルを表すデータ構造です。"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from ommx.v1 import Instance"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": ".venv",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.4"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}