diff --git a/NodeSrv/apps/healthcheck-survey-bot/src/lib/employeeMasterCheck.js b/NodeSrv/apps/healthcheck-survey-bot/src/lib/employeeMasterCheck.js
new file mode 100644
index 00000000..58e3a55b
--- /dev/null
+++ b/NodeSrv/apps/healthcheck-survey-bot/src/lib/employeeMasterCheck.js
@@ -0,0 +1,18 @@
+// src/lib/employeeMasterCheck.js
+function checkEmailConsistency(pleasanterEmail, masterRecord) {
+  const masterEmail = masterRecord.Class036 || masterRecord.ClassB || null;
+  if (!masterEmail) {
+    return { consistent: false, masterEmail: null };
+  }
+  return { consistent: masterEmail === pleasanterEmail, masterEmail };
+}
+
+function resolveKanaFromMaster(masterRecord) {
+  return [masterRecord.Class003, masterRecord.Class004].filter(Boolean).join(" ");
+}
+
+function needsKanaFill(currentKana) {
+  return currentKana === null || currentKana === undefined || currentKana === "";
+}
+
+module.exports = { checkEmailConsistency, resolveKanaFromMaster, needsKanaFill };
diff --git a/NodeSrv/apps/healthcheck-survey-bot/test/employeeMasterCheck.test.js b/NodeSrv/apps/healthcheck-survey-bot/test/employeeMasterCheck.test.js
new file mode 100644
index 00000000..4f977025
--- /dev/null
+++ b/NodeSrv/apps/healthcheck-survey-bot/test/employeeMasterCheck.test.js
@@ -0,0 +1,56 @@
+// test/employeeMasterCheck.test.js
+const { test } = require("node:test");
+const assert = require("node:assert");
+const {
+  checkEmailConsistency,
+  resolveKanaFromMaster,
+  needsKanaFill,
+} = require("../src/lib/employeeMasterCheck");
+
+test("checkEmailConsistency: PLメールアドレス(Class036)と一致すればconsistent:true", () => {
+  const result = checkEmailConsistency("taro.yamada@next-hd.co.jp", {
+    Class036: "taro.yamada@next-hd.co.jp",
+    ClassB: "taro.yamada@example.com",
+  });
+  assert.deepStrictEqual(result, { consistent: true, masterEmail: "taro.yamada@next-hd.co.jp" });
+});
+
+test("checkEmailConsistency: Class036が無ければClassBにフォールバックする", () => {
+  const result = checkEmailConsistency("taro.yamada@example.com", {
+    ClassB: "taro.yamada@example.com",
+  });
+  assert.deepStrictEqual(result, { consistent: true, masterEmail: "taro.yamada@example.com" });
+});
+
+test("checkEmailConsistency: 不一致ならconsistent:false", () => {
+  const result = checkEmailConsistency("taro.yamada@next-hd.co.jp", {
+    Class036: "different@next-hd.co.jp",
+  });
+  assert.deepStrictEqual(result, { consistent: false, masterEmail: "different@next-hd.co.jp" });
+});
+
+test("checkEmailConsistency: マスタ側にメールが無ければmasterEmail:null・consistent:false", () => {
+  const result = checkEmailConsistency("taro.yamada@next-hd.co.jp", {});
+  assert.deepStrictEqual(result, { consistent: false, masterEmail: null });
+});
+
+test("resolveKanaFromMaster: 姓カナ+名カナを空白区切りで結合する", () => {
+  assert.strictEqual(
+    resolveKanaFromMaster({ Class003: "ヤマダ", Class004: "タロウ" }),
+    "ヤマダ タロウ"
+  );
+});
+
+test("resolveKanaFromMaster: 片方欠けていても結合できる", () => {
+  assert.strictEqual(resolveKanaFromMaster({ Class003: "ヤマダ" }), "ヤマダ");
+});
+
+test("needsKanaFill: 空文字・未定義はtrue", () => {
+  assert.strictEqual(needsKanaFill(""), true);
+  assert.strictEqual(needsKanaFill(undefined), true);
+  assert.strictEqual(needsKanaFill(null), true);
+});
+
+test("needsKanaFill: 値が入っていればfalse", () => {
+  assert.strictEqual(needsKanaFill("ヤマダ タロウ"), false);
+});