diff --git a/src/api/auth.ts b/src/api/auth.ts
index 2ec6c98..460f28c 100644
--- a/src/api/auth.ts
+++ b/src/api/auth.ts
@@ -31,7 +31,30 @@ export const me = async () => {
   return res;
 };
 
-export const login = async (param: { email: string; password: string }) => {
+export type LoginCheckRequest = {
+  email: string;
+  password: string;
+};
+export type LoginCheckResponse = {
+  data: {
+    customer_code: number;
+    name: string;
+  }[];
+} & APICommonResponse;
+export const loginCheck = async (param: LoginCheckRequest) => {
+  const res = await request<LoginCheckResponse>({
+    url: getUrl(ApiId.LOGIN_CHECK),
+    method: HttpMethod.POST,
+    data: param,
+  });
+  return res;
+};
+
+export const login = async (param: {
+  email: string;
+  password: string;
+  customer_code: number;
+}) => {
   const res = await request<MeResponse>({
     url: getUrl(ApiId.LOGIN),
     method: HttpMethod.POST,
diff --git a/src/api/index.ts b/src/api/index.ts
index a5c2b18..26ab5f1 100644
--- a/src/api/index.ts
+++ b/src/api/index.ts
@@ -13,6 +13,7 @@ export const ApiId = {
   // 認証関連 ----------------------------------
   ME: id++,
   LOGIN: id++,
+  LOGIN_CHECK: id++,
   LOGOUT: id++,
   PASSWORD_SETTING_START: id++,
   PASSWORD_SETTING_VERIFY: id++,
diff --git a/src/api/url.ts b/src/api/url.ts
index 29cd681..391aa3f 100644
--- a/src/api/url.ts
+++ b/src/api/url.ts
@@ -5,6 +5,7 @@ const urls = {
   [A.CSRF_TOKEN]: "sanctum/csrf-cookie",
   [A.ME]: "me",
   [A.LOGIN]: "login",
+  [A.LOGIN_CHECK]: "login/check",
   [A.LOGOUT]: "logout",
   [A.PASSWORD_SETTING_START]: "password/setting/start",
   [A.PASSWORD_SETTING_VERIFY]: "password/setting/verify",
diff --git a/src/contexts/AuthContext.tsx b/src/contexts/AuthContext.tsx
index 9ae0d06..eafa4cb 100644
--- a/src/contexts/AuthContext.tsx
+++ b/src/contexts/AuthContext.tsx
@@ -12,7 +12,11 @@ type Auth = {
   email: string;
   user: Me | null;
 
-  login: (email: string, password: string) => Promise<boolean>;
+  login: (
+    email: string,
+    password: string,
+    customerCode: number
+  ) => Promise<boolean>;
   logout: VoidFunction;
   me: VoidFunction;
 };
@@ -25,7 +29,7 @@ export const AuthContext = createContext<Auth>({
   email: "",
   user: null,
 
-  login: async (email: string, password: string) => false,
+  login: async (email: string, password: string, customerCode: number) => false,
   logout: () => {},
   me: () => {},
 });
@@ -80,8 +84,16 @@ function AuthContextProvider({ children }: Props) {
     setUser(null);
   };
 
-  const login = async (email: string, password: string) => {
-    const res = await callLogin({ email, password });
+  const login = async (
+    email: string,
+    password: string,
+    customerCode: number
+  ) => {
+    const res = await callLogin({
+      email,
+      password,
+      customer_code: customerCode,
+    });
     return res?.result === ResultCode.SUCCESS;
   };
   const logout = () => {
diff --git a/src/pages/auth/login.tsx b/src/pages/auth/login.tsx
index ce627a0..bd3ae19 100644
--- a/src/pages/auth/login.tsx
+++ b/src/pages/auth/login.tsx
@@ -1,13 +1,14 @@
 import { yupResolver } from "@hookform/resolvers/yup";
-import { LoadingButton } from "@mui/lab";
-import { Box, Button, Stack, Typography } from "@mui/material";
+import { Box, Button, Card, Stack, Typography } from "@mui/material";
+import { LoginCheckResponse, loginCheck } from "api/auth";
 import InputAlert from "components/form/InputAlert";
 import { FormProvider, RHFTextField } from "components/hook-form";
+import useAPICall from "hooks/useAPICall";
 import useAuth from "hooks/useAuth";
 import useNavigateCustom from "hooks/useNavigateCustom";
 import useSnackbarCustom from "hooks/useSnackbarCustom";
 import { PageID } from "pages";
-import { useState } from "react";
+import { useEffect, useMemo, useState } from "react";
 import { useForm } from "react-hook-form";
 import { useLocation } from "react-router-dom";
 import { getPath } from "routes/path";
@@ -28,7 +29,9 @@ export default function Login() {
   const { pathname } = useLocation();
 
   const [message, setMessage] = useState("");
-  const [sending, setSending] = useState(false);
+  const [checkResponse, setCheckResponse] = useState<LoginCheckResponse | null>(
+    null
+  );
 
   const { login } = useAuth();
 
@@ -42,49 +45,101 @@ export default function Login() {
     resolver: yupResolver(LoginSchema),
   });
 
-  const handleSubmit = async (data: FormProps) => {
-    setMessage("");
-    setSending(true);
-    const ret = await login(data.email, data.password);
+  const { callAPI: callLoginCheck } = useAPICall({
+    apiMethod: loginCheck,
+    backDrop: true,
+    form,
+    onSuccess: (res) => {
+      setCheckResponse(res);
+    },
+    onFailed: () => {
+      error("ログイン失敗");
+      setMessage("入力情報を確認してください");
+      setCheckResponse(null);
+    },
+  });
 
-    setSending(false);
+  const handleSubmit = async (data: FormProps) => {
+    callLoginCheck(data);
+  };
 
-    if (ret) {
-      success("ログイン成功");
-      if (pathname === getPath(PageID.LOGIN)) {
-        navigateWhenChanged(getPath(PageID.DASHBOARD_OVERVIEW));
+  const handleSelect = (customerCode: number) => {
+    login(
+      form.getValues("email"),
+      form.getValues("password"),
+      customerCode
+    ).then((ret) => {
+      if (ret) {
+        success("ログイン成功");
+        if (pathname === getPath(PageID.LOGIN)) {
+          navigateWhenChanged(getPath(PageID.DASHBOARD_OVERVIEW));
+        }
+      } else {
+        error("ログイン失敗");
+        setMessage("入力情報を確認してください");
+        setCheckResponse(null);
       }
-    } else {
-      error("ログイン失敗");
-      setMessage("入力情報を確認してください");
-    }
+    });
   };
 
+  const needSelectUser: boolean = useMemo(() => {
+    return checkResponse !== null && 1 < checkResponse.data.length;
+  }, [checkResponse]);
+
+  useEffect(() => {
+    if (checkResponse && checkResponse.data.length === 1) {
+      const customerCode = checkResponse.data[0].customer_code;
+      handleSelect(customerCode);
+    }
+  }, [checkResponse]);
+
   return (
     <FormProvider methods={form} onSubmit={form.handleSubmit(handleSubmit)}>
       <Box sx={{ p: 3, pt: 5, mx: "auto", maxWidth: 500 }} textAlign="center">
         <Stack spacing={3}>
           <Typography variant="h5">ログイン</Typography>
-          <InputAlert error="none" message={message} />
-          <RHFTextField name="email" label="email" size="small" />
-          <RHFTextField
-            name="password"
-            type="password"
-            label="password"
-            size="small"
-          />
+          {needSelectUser && (
+            <>
+              <Typography variant="h6">ユーザー選択</Typography>
+              {checkResponse?.data.map((ele) => {
+                return (
+                  <Button
+                    variant="outlined"
+                    key={ele.customer_code}
+                    onClick={() => handleSelect(ele.customer_code)}
+                  >
+                    <Typography>{ele.name}</Typography>
+                  </Button>
+                );
+              })}
+            </>
+          )}
+          {!needSelectUser && (
+            <>
+              <InputAlert error="none" message={message} />
+              <RHFTextField name="email" label="email" size="small" />
+              <RHFTextField
+                name="password"
+                type="password"
+                label="password"
+                size="small"
+              />
 
-          <LoadingButton loading={sending} type="submit" variant="contained">
-            ログイン
-          </LoadingButton>
-          <Button
-            variant="outlined"
-            onClick={() => {
-              navigateWhenChanged(getPath(PageID.USER_SETTING_PASSWORD_START));
-            }}
-          >
-            パスワードを忘れた/設定したい
-          </Button>
+              <Button type="submit" variant="contained">
+                ログイン
+              </Button>
+              <Button
+                variant="outlined"
+                onClick={() => {
+                  navigateWhenChanged(
+                    getPath(PageID.USER_SETTING_PASSWORD_START)
+                  );
+                }}
+              >
+                パスワードを忘れた/設定したい
+              </Button>
+            </>
+          )}
         </Stack>
       </Box>
     </FormProvider>