diff --git a/NodeSrv/apps/healthcheck-survey-bot/src/lib/templateFill.js b/NodeSrv/apps/healthcheck-survey-bot/src/lib/templateFill.js
new file mode 100644
index 00000000..c077164e
--- /dev/null
+++ b/NodeSrv/apps/healthcheck-survey-bot/src/lib/templateFill.js
@@ -0,0 +1,26 @@
+function isUnsetSentinel(value) {
+  return typeof value === "string" && value.startsWith("1899");
+}
+
+function fillTemplate(template, columns, valueHash) {
+  const labelToColumnName = new Map();
+  for (const column of columns) {
+    if (column.LabelText) {
+      labelToColumnName.set(column.LabelText, column.ColumnName);
+    }
+  }
+
+  return template.replace(/\{([^{}]+)\}/g, (matched, label) => {
+    const columnName = labelToColumnName.get(label);
+    if (!columnName) {
+      return matched;
+    }
+    const value = valueHash[columnName];
+    if (value === undefined || value === null || value === "" || isUnsetSentinel(value)) {
+      return "未設定";
+    }
+    return String(value);
+  });
+}
+
+module.exports = { fillTemplate };
diff --git a/NodeSrv/apps/healthcheck-survey-bot/test/templateFill.test.js b/NodeSrv/apps/healthcheck-survey-bot/test/templateFill.test.js
new file mode 100644
index 00000000..e5deb8b5
--- /dev/null
+++ b/NodeSrv/apps/healthcheck-survey-bot/test/templateFill.test.js
@@ -0,0 +1,35 @@
+// test/templateFill.test.js
+const { test } = require("node:test");
+const assert = require("node:assert");
+const { fillTemplate } = require("../src/lib/templateFill");
+
+const columns = [
+  { ColumnName: "Class003", LabelText: "検査機関" },
+  { ColumnName: "Date001", LabelText: "検査日" },
+];
+
+test("プレースホルダーをレコード値で置換する", () => {
+  const result = fillTemplate(
+    "検査機関: {検査機関}\n日程: {検査日}",
+    columns,
+    { Class003: "next健診クリニック", Date001: "2026-04-01T00:00:00" }
+  );
+  assert.strictEqual(result, "検査機関: next健診クリニック\n日程: 2026-04-01T00:00:00");
+});
+
+test("未設定の日付センチネル値は「未設定」に変換する", () => {
+  const result = fillTemplate("日程: {検査日}", columns, {
+    Date001: "1899-12-30T00:00:00",
+  });
+  assert.strictEqual(result, "日程: 未設定");
+});
+
+test("値が無い列は「未設定」に変換する", () => {
+  const result = fillTemplate("検査機関: {検査機関}", columns, {});
+  assert.strictEqual(result, "検査機関: 未設定");
+});
+
+test("対応するラベルが見つからないプレースホルダーはそのまま残す", () => {
+  const result = fillTemplate("不明: {存在しないラベル}", columns, {});
+  assert.strictEqual(result, "不明: {存在しないラベル}");
+});