diff --git a/src/pages/common/register/api/hooks/useRegister.ts b/src/pages/common/register/api/hooks/useRegister.ts
new file mode 100644
index 00000000..f5e201e8
--- /dev/null
+++ b/src/pages/common/register/api/hooks/useRegister.ts
@@ -0,0 +1,47 @@
+import { useNavigate } from 'react-router-dom';
+
+import { AxiosError } from 'axios';
+
+import { RouterPath } from '@/app/routes/path';
+import {
+  SignupApiResponse,
+  registerUser,
+} from '@/shared/api/auth/user-register';
+import { authLocalStorage } from '@/shared/utils/storage';
+import { useMutation } from '@tanstack/react-query';
+
+const useRegister = () => {
+  const navigate = useNavigate();
+
+  const handleSuccess = (data: SignupApiResponse) => {
+    if ('status' in data && data.status === 207) {
+      alert(data.detail);
+    } else {
+      console.log(data);
+      if ('accessToken' in data) {
+        authLocalStorage.set(data.accessToken);
+        authLocalStorage.set(data.refreshToken);
+        alert('회원가입이 완료되었습니다.');
+        navigate(data.isSinitto === 'true' ? RouterPath.ROOT : RouterPath.ROOT);
+      }
+    }
+  };
+
+  const handleError = (error: AxiosError) => {
+    if (error.response && error.response.data) {
+      alert('회원가입 중 오류가 발생했습니다.');
+    } else {
+      alert('회원가입 중 네트워크 오류가 발생했습니다.');
+    }
+  };
+
+  const mutation = useMutation({
+    mutationFn: registerUser,
+    onSuccess: handleSuccess,
+    onError: handleError,
+  });
+
+  return mutation;
+};
+
+export default useRegister;
diff --git a/src/pages/common/register/index.tsx b/src/pages/common/register/index.tsx
index 9677a74c..b3dce8dd 100644
--- a/src/pages/common/register/index.tsx
+++ b/src/pages/common/register/index.tsx
@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { useForm } from 'react-hook-form';
 
+import useRegister from './api/hooks/useRegister';
 import { RegisterFields } from './components/register-fields';
 import { RegisterType } from './components/register-type';
 import { Tos } from './components/tos';
@@ -17,13 +18,26 @@ const RegisterPage = () => {
     formState: { errors },
   } = useForm<FormValues>();
 
+  // 회원가입 처리
+  const mutation = useRegister();
+
   const handleUserType = (id: string) => {
     setUserType(id);
   };
 
   const onSubmit = (data: FormValues) => {
-    // 회원가입 api
-    console.log(userType, data);
+    // request 에 맞게 데이터 병합
+    const isSinitto = userType === 'sinitto';
+
+    const requestData = {
+      name: data.name,
+      phoneNumber: data.phoneNumber,
+      email: 'test1@example.com', // 임시 (카카오 로그인 후 넘겨받기)
+      isSinitto,
+    };
+    console.log(requestData);
+    // 회원가입 API 호출
+    mutation.mutate(requestData);
   };
 
   return (
diff --git a/src/shared/api/auth/user-register.ts b/src/shared/api/auth/user-register.ts
new file mode 100644
index 00000000..f628e925
--- /dev/null
+++ b/src/shared/api/auth/user-register.ts
@@ -0,0 +1,53 @@
+import { fetchInstance } from '../instance';
+
+// request(요청) 타입
+export type SignupReguestParams = {
+  name: string;
+  phoneNumber: string;
+  email: string;
+  isSinitto: boolean;
+};
+
+// response(응답) 타입 - 성공
+export type SignupResponse = {
+  accessToken: string;
+  refreshToken: string;
+  isSinitto?: 'true' | 'false';
+};
+
+// 에러(아직 정확히 에러코드 확인 x) or 예외
+export type SignupErrorResponse = {
+  status: number;
+  detail: string;
+};
+
+// 공통 타입 정의 (onSuccess 내부에서 분기)
+export type SignupApiResponse = SignupResponse | SignupErrorResponse;
+
+export const registerUser = async ({
+  name,
+  phoneNumber,
+  email,
+  isSinitto,
+}: SignupReguestParams): Promise<SignupApiResponse> => {
+  try {
+    // 시니또 보호자에 따라 API 엔드포인트 구분
+    const endpoint = isSinitto ? 'sinitto' : 'guard';
+
+    const response = await fetchInstance.post(`/api/members/${endpoint}`, {
+      name,
+      phoneNumber,
+      email,
+      isSinitto,
+    });
+    if (response.status === 207) {
+      return {
+        status: response.status,
+        detail: response.data.detail,
+      } as SignupErrorResponse; // 207 (예외 - 중복 이메일)
+    }
+    return response.data; // 200
+  } catch (err) {
+    throw new Error('회원가입 실패');
+  }
+};
diff --git a/src/shared/api/instance/index.ts b/src/shared/api/instance/index.ts
index 439db8ec..dbe8c22c 100644
--- a/src/shared/api/instance/index.ts
+++ b/src/shared/api/instance/index.ts
@@ -17,8 +17,10 @@ const initInstance = (config: AxiosRequestConfig): AxiosInstance => {
   return instance;
 };
 
+export const BASE_URL = 'http://43.201.254.198:8080';
+
 export const fetchInstance = initInstance({
-  baseURL: 'https://api.example.com',
+  baseURL: 'http://43.201.254.198:8080',
 });
 
 export const queryClient = new QueryClient({
diff --git a/src/shared/utils/storage/index.ts b/src/shared/utils/storage/index.ts
new file mode 100644
index 00000000..c562a0b8
--- /dev/null
+++ b/src/shared/utils/storage/index.ts
@@ -0,0 +1,24 @@
+type StorageKey = {
+  accessToken?: string;
+};
+
+const initStorage = <T extends keyof StorageKey>(key: T, storage: Storage) => {
+  const storageKey = `${key}`;
+
+  const get = (): StorageKey[T] => {
+    const value = storage.getItem(storageKey);
+    return value as StorageKey[T];
+  };
+
+  const set = (value: StorageKey[T]) => {
+    if (value == undefined || value == null) {
+      return storage.removeItem(storageKey);
+    }
+    const stringifiedValue = JSON.stringify(value);
+    storage.setItem(storageKey, stringifiedValue);
+  };
+
+  return { get, set };
+};
+
+export const authLocalStorage = initStorage('accessToken', localStorage);