diff --git a/src/App.tsx b/src/App.tsx
index ca86023..2101c5e 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -2,9 +2,13 @@ import "./App.css";
 
 import { RouterProvider } from "react-router-dom";
 
+import { useTokenRefresh } from "@/hooks/auth/useTokenRefresh";
+
 import { router } from "@/routes/Router";
 
 function App() {
+  useTokenRefresh();
+
   return (
     <>
       <RouterProvider router={router} />
diff --git a/src/constants/auth.ts b/src/constants/auth.ts
deleted file mode 100644
index a42594d..0000000
--- a/src/constants/auth.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-// 인증번호 입력 시간 상수화
-export const AUTH_TIMER_DURATION = 180;
diff --git a/src/hooks/auth/useEmailVerification.ts b/src/hooks/auth/useEmailVerification.ts
index ac39224..9355ee1 100644
--- a/src/hooks/auth/useEmailVerification.ts
+++ b/src/hooks/auth/useEmailVerification.ts
@@ -4,8 +4,6 @@ import { zodResolver } from "@hookform/resolvers/zod";
 import { toast } from "sonner";
 import type { z } from "zod";
 
-import { AUTH_TIMER_DURATION } from "@/constants/auth";
-
 import { step01Schema } from "@/utils/validation";
 
 import { useAuth } from "@/hooks/auth/useAuth";
@@ -43,14 +41,11 @@ export const useEmailVerification = ({
   const watchedEmail = useWatch({ control, name: "email" });
   const watchedCode = useWatch({ control, name: "code" });
 
-  const { formattedTime, restart, stop, isExpired } = useTimer(
-    AUTH_TIMER_DURATION,
-    {
-      onExpire: () => {
-        toast.error("인증 시간이 만료되었습니다. 다시 시도해주세요.");
-      },
+  const { formattedTime, restart, stop, isExpired } = useTimer(0, {
+    onExpire: () => {
+      toast.error("인증 시간이 만료되었습니다. 다시 시도해주세요.");
     },
-  );
+  });
 
   const handleEditEmail = useCallback(() => {
     setSendCode(false);
diff --git a/src/hooks/auth/useTokenRefresh.ts b/src/hooks/auth/useTokenRefresh.ts
new file mode 100644
index 0000000..e046b60
--- /dev/null
+++ b/src/hooks/auth/useTokenRefresh.ts
@@ -0,0 +1,25 @@
+import { useEffect } from "react";
+
+import { reissueToken } from "@/api/auth/auth";
+import useAuthStore from "@/store/useAuthStore";
+
+export const useTokenRefresh = () => {
+  const { setAccessToken, login, logout } = useAuthStore();
+
+  useEffect(() => {
+    const initAuth = async () => {
+      try {
+        const { data } = await reissueToken();
+        if (data.accessToken) {
+          // TODO: 재발급 성공 시 로그인 처리
+          login("user@example.com", data.accessToken);
+        }
+      } catch (error) {
+        console.log("토큰 재발급 실패:", error);
+        logout();
+      }
+    };
+
+    initAuth();
+  }, [login, logout, setAccessToken]);
+};
diff --git a/src/lib/axiosInstance.ts b/src/lib/axiosInstance.ts
index cde2d72..846cd2a 100644
--- a/src/lib/axiosInstance.ts
+++ b/src/lib/axiosInstance.ts
@@ -2,23 +2,26 @@ import axios, { type AxiosRequestConfig } from "axios";
 
 import useAuthStore from "@/store/useAuthStore";
 
+const BASE_URL = import.meta.env.VITE_API_BASE_URL;
+
+if (!BASE_URL) {
+  throw new Error("API 서버 주소(VITE_API_BASE_URL)가 설정되지 않았습니다.");
+}
+
 const axiosConfig: AxiosRequestConfig = {
-  baseURL: import.meta.env.VITE_API_BASE_URL,
+  baseURL: BASE_URL,
   withCredentials: true,
   headers: {
     "Content-Type": "application/json",
   },
 };
 
-// 일반 API 요청용
 export const axiosInstance = axios.create(axiosConfig);
-
-// 토큰 재발급 전용
 export const authInstance = axios.create(axiosConfig);
 
 axiosInstance.interceptors.request.use(
   (config) => {
-    const token = localStorage.getItem("accessToken");
+    const token = useAuthStore.getState().accessToken;
 
     if (token) {
       config.headers.Authorization = `Bearer ${token}`;
@@ -31,16 +34,28 @@ axiosInstance.interceptors.request.use(
 );
 
 let isRefreshing = false;
-let refreshSubscribers: ((token: string) => void)[] = [];
+interface IRefreshSubscriber {
+  resolve: (token: string) => void;
+  reject: (error: unknown) => void;
+}
+
+let refreshSubscribers: IRefreshSubscriber[] = [];
 
-// 대기 요청 처리
 const onRefreshed = (accessToken: string) => {
-  refreshSubscribers.forEach((callback) => callback(accessToken));
+  refreshSubscribers.forEach(({ resolve }) => resolve(accessToken));
   refreshSubscribers = [];
 };
 
-const addRefreshSubscriber = (callback: (token: string) => void) => {
-  refreshSubscribers.push(callback);
+const onRefreshFailed = (error: unknown) => {
+  refreshSubscribers.forEach(({ reject }) => reject(error));
+  refreshSubscribers = [];
+};
+
+const addRefreshSubscriber = (
+  resolve: (token: string) => void,
+  reject: (error: unknown) => void,
+) => {
+  refreshSubscribers.push({ resolve, reject });
 };
 
 axiosInstance.interceptors.response.use(
@@ -50,28 +65,29 @@ axiosInstance.interceptors.response.use(
   async (error) => {
     const originalRequest = error.config;
 
-    // 401 에러 감지
     if (error.response?.status === 401) {
-      // 재발급 진행 중: 대기열 등록
       if (isRefreshing) {
-        return new Promise((resolve) => {
-          addRefreshSubscriber((accessToken: string) => {
-            originalRequest.headers.Authorization = `Bearer ${accessToken}`;
-            resolve(axiosInstance(originalRequest));
-          });
+        return new Promise((resolve, reject) => {
+          addRefreshSubscriber(
+            (accessToken: string) => {
+              originalRequest.headers.Authorization = `Bearer ${accessToken}`;
+              resolve(axiosInstance(originalRequest));
+            },
+            (refreshError: unknown) => {
+              reject(refreshError);
+            },
+          );
         });
       }
 
-      // 재발급 실패: 로그아웃
       if (
         originalRequest.url?.includes("/api/auth/reissue") ||
         originalRequest._retry
       ) {
-        localStorage.removeItem("accessToken");
+        useAuthStore.getState().logout();
         return Promise.reject(error);
       }
 
-      // 첫 401: 재발급 시도
       originalRequest._retry = true;
       isRefreshing = true;
 
@@ -79,21 +95,18 @@ axiosInstance.interceptors.response.use(
         const { data } = await authInstance.post("/api/auth/reissue");
 
         const newAccessToken = data.data.accessToken;
-        localStorage.setItem("accessToken", newAccessToken);
 
-        // 대기 요청 일괄 처리
+        useAuthStore.getState().setAccessToken(newAccessToken);
         onRefreshed(newAccessToken);
 
-        // 현재 요청 재시도
         originalRequest.headers.Authorization = `Bearer ${newAccessToken}`;
         return axiosInstance(originalRequest);
       } catch (refreshError) {
-        // 재발급 실패: 로그아웃
-        console.error("Token reissue failed:", refreshError);
+        console.error("토큰 재발급 실패:", refreshError);
+        onRefreshFailed(refreshError);
         useAuthStore.getState().logout();
         return Promise.reject(refreshError);
       } finally {
-        // 상태 초기화
         isRefreshing = false;
         refreshSubscribers = [];
       }
diff --git a/src/pages/auth/RedirectPage.tsx b/src/pages/auth/RedirectPage.tsx
index be011a8..2c6537a 100644
--- a/src/pages/auth/RedirectPage.tsx
+++ b/src/pages/auth/RedirectPage.tsx
@@ -19,16 +19,22 @@ export default function RedirectPage() {
       if (parts.length === 2) return parts.pop()?.split(";").shift();
     };
 
+    const deleteCookie = (name: string) => {
+      document.cookie =
+        name + "=; Max-Age=0; path=/; expires=Thu, 01 Jan 1970 00:00:01 GMT;";
+    };
+
     const accessToken = getCookie("access_token");
 
     if (accessToken) {
-      // TODO: Zustand 로그인 상태 업데이트 - 추후 내 정보 조회 API 연동 시 수정
+      // TODO: 로그인 상태 업데이트
       login("social@user.com", accessToken);
 
+      deleteCookie("access_token");
+
       toast.success("소셜 로그인되었습니다.");
       navigate("/", { replace: true });
     } else {
-      console.error("No access token found in cookies.");
       toast.error("소셜 로그인에 실패했습니다. 다시 시도해주세요.");
       navigate("/login", { replace: true });
     }
diff --git a/src/store/useAuthStore.ts b/src/store/useAuthStore.ts
index bb19dff..e1f95d9 100644
--- a/src/store/useAuthStore.ts
+++ b/src/store/useAuthStore.ts
@@ -2,12 +2,14 @@ import { create } from "zustand";
 
 interface IAuthState {
   isLoggedIn: boolean;
+  accessToken: string | null;
   email: string;
   password: string;
   socialId: number;
 
   login: (email: string, accessToken: string) => void;
   logout: () => void;
+  setAccessToken: (token: string) => void;
   setEmail: (email: string) => void;
   setPassword: (password: string) => void;
   setSocialId: (socialId: number) => void;
@@ -16,22 +18,31 @@ interface IAuthState {
 
 const useAuthStore = create<IAuthState>((set) => ({
   isLoggedIn: false,
+  accessToken: null,
   email: "",
   password: "",
   socialId: -1,
+
   login: (email, accessToken) => {
-    localStorage.setItem("accessToken", accessToken);
-    set({ isLoggedIn: true, email });
+    set({ isLoggedIn: true, email, accessToken });
   },
   logout: () => {
     localStorage.removeItem("accessToken");
-    set({ isLoggedIn: false, email: "", password: "", socialId: -1 });
+    localStorage.removeItem("refreshToken");
+    set({
+      isLoggedIn: false,
+      accessToken: null,
+      email: "",
+      password: "",
+      socialId: -1,
+    });
   },
 
+  setAccessToken: (token) => set({ accessToken: token }),
   setEmail: (email) => set({ email }),
   setPassword: (password) => set({ password }),
   setSocialId: (socialId) => set({ socialId }),
-  resetAuth: () => set({ email: "", password: "" }),
+  resetAuth: () => set({ email: "", password: "", accessToken: null }),
 }));
 
 export default useAuthStore;
diff --git a/src/types/common/common.ts b/src/types/common/common.ts
index 8e3643a..1847dfe 100644
--- a/src/types/common/common.ts
+++ b/src/types/common/common.ts
@@ -11,7 +11,6 @@ export interface ICommonResponse<T> {
   data: T;
 }
 
-// useCoreQuery 옵션 타입
 export type TUseQueryCustomOptions<
   TQueryFnData = unknown,
   TData = TQueryFnData,
@@ -20,7 +19,6 @@ export type TUseQueryCustomOptions<
   "queryKey" | "queryFn"
 >;
 
-// useCoreMutation 옵션 타입
 export type TUseMutationCustomOptions<
   TData = unknown,
   TVariables = unknown,