diff --git a/WebContent/jsp/common/include/script.jsp b/WebContent/jsp/common/include/script.jsp
index 1e96177..d4195f2 100644
--- a/WebContent/jsp/common/include/script.jsp
+++ b/WebContent/jsp/common/include/script.jsp
@@ -30,6 +30,10 @@
 <script language="javascript" src="<c:url value="/js/jquery.contextMenu.js"/>"></script>
 <script language="javascript" src="<c:url value="/js/custom.js"/>"></script>
 <script language="javascript" src="<c:url value="/js/common-${locale}.js"/>"></script>
+<script type="text/javascript">
+/* 자동 로그아웃: iframe 내 활동을 sessionStorage에 기록 (main.jsp 타이머와 공유) */
+(function() { var m = function() { sessionStorage.setItem('lastActivity', String(Date.now())); }; ['mousemove','keydown','click','touchstart'].forEach(function(e){ document.addEventListener(e, m, true); }); })();
+</script>
 <script language="javascript" src="<c:url value="/js/jquery.inputmask.bundle.min.js"/>"></script>
 <script language="javascript" src="<c:url value="/js/jquery.searchabledropdown-1.0.8.min.js"/>"></script>
 <%-- <script language="javascript" src="<c:url value="/js/jquery.searchable-1.1.0.min.js"/>"></script> --%>
diff --git a/WebContent/jsp/common/screen/main.jsp b/WebContent/jsp/common/screen/main.jsp
index 0642401..8748ef8 100644
--- a/WebContent/jsp/common/screen/main.jsp
+++ b/WebContent/jsp/common/screen/main.jsp
@@ -99,6 +99,93 @@
 		<iframe class="topMenu" src="" id="topFrame" name="topFrame" scrolling="no" noresize="noresize"></iframe>
 		<iframe class="leftMenu" src="" name="leftFrame" scrolling="no" noresize="noresize"></iframe>
 		<iframe class="rightCon" src="" name="mainFrame" scrolling="auto"></iframe>
-</body>	
+
+		<%-- 자동 로그아웃 경고 모달 --%>
+		<div id="autoLogoutModal" style="display:none; position:fixed; top:0; left:0; width:100%; height:100%; background:rgba(0,0,0,0.5); z-index:99999;">
+			<div style="position:absolute; top:50%; left:50%; transform:translate(-50%,-50%); background:#fff; padding:30px 40px; border-radius:4px; text-align:center; min-width:320px; box-shadow:0 4px 20px rgba(0,0,0,0.3);">
+				<h3 style="margin:0 0 12px; color:#333; font-size:16px;">자동 로그아웃 안내</h3>
+				<p style="margin:0 0 22px; color:#666; font-size:14px;">
+					장시간 사용하지 않아 <strong><span id="autoLogoutSeconds">60</span>초</strong> 후 자동 로그아웃됩니다.
+				</p>
+				<button id="autoLogoutContinue" style="margin-right:8px; padding:8px 22px; background:#337ab7; color:#fff; border:none; border-radius:3px; cursor:pointer; font-size:13px;">계속 사용</button>
+				<button id="autoLogoutNow"      style="padding:8px 22px; background:#d9534f; color:#fff; border:none; border-radius:3px; cursor:pointer; font-size:13px;">로그아웃</button>
+			</div>
+		</div>
+
+		<script type="text/javascript">
+		(function () {
+			var IDLE_MS   = ${autoLogoutTimeout} * 60 * 1000;  // 설정값(분) → ms
+			var WARN_MS   = 60 * 1000;   // 로그아웃 1분 전 경고
+			var CHECK_INTERVAL = 5000;   // 5초 간격 체크
+			var countdownTimer = null;
+
+			/* sessionStorage: iframe 포함 모든 동일-origin 프레임과 공유 */
+			function getLastActivity() {
+				var t = sessionStorage.getItem('lastActivity');
+				return t ? parseInt(t, 10) : Date.now();
+			}
+			function markActivity() {
+				sessionStorage.setItem('lastActivity', String(Date.now()));
+			}
+
+			function resetTimer() {
+				markActivity();
+				if ($('#autoLogoutModal').is(':visible')) {
+					$('#autoLogoutModal').hide();
+					clearInterval(countdownTimer);
+				}
+			}
+
+			function showWarning(remainMs) {
+				var sec = Math.ceil(remainMs / 1000);
+				$('#autoLogoutSeconds').text(sec);
+				$('#autoLogoutModal').show();
+				clearInterval(countdownTimer);
+				countdownTimer = setInterval(function () {
+					sec--;
+					if (sec <= 0) {
+						clearInterval(countdownTimer);
+						doLogout();
+					} else {
+						$('#autoLogoutSeconds').text(sec);
+					}
+				}, 1000);
+			}
+
+			function doLogout() {
+				location.href = '<%=request.getContextPath()%>/rms/logout.do';
+			}
+
+			/* 상위 프레임(main.jsp) 활동 감지 */
+			['mousemove', 'keydown', 'click', 'touchstart'].forEach(function (e) {
+				document.addEventListener(e, markActivity, true);
+			});
+
+			/* 주기적 유휴 시간 체크 */
+			setInterval(function () {
+				var idle    = Date.now() - getLastActivity();
+				var remain  = IDLE_MS - idle;
+				if (remain <= 0) {
+					clearInterval(countdownTimer);
+					doLogout();
+				} else if (remain <= WARN_MS && !$('#autoLogoutModal').is(':visible')) {
+					showWarning(remain);
+				}
+			}, CHECK_INTERVAL);
+
+			/* 버튼 이벤트 */
+			$(document).on('click', '#autoLogoutContinue', function () {
+				resetTimer();
+				$.get('<%=request.getContextPath()%>/checkSession.do'); // 서버 세션도 갱신
+			});
+			$(document).on('click', '#autoLogoutNow', function () {
+				doLogout();
+			});
+
+			/* 페이지 로드 시 초기화 */
+			markActivity();
+		})();
+		</script>
+</body>
 </html>
  
diff --git a/src/main/java/com/eactive/eai/rms/common/context/MonitoringContext.java b/src/main/java/com/eactive/eai/rms/common/context/MonitoringContext.java
index f274bf3..e9d6ed9 100644
--- a/src/main/java/com/eactive/eai/rms/common/context/MonitoringContext.java
+++ b/src/main/java/com/eactive/eai/rms/common/context/MonitoringContext.java
@@ -255,6 +255,9 @@ public interface MonitoringContext {
    // 이중 로그인 허용여부
    public static final String RMS_DUAL_LOGIN_ENABLED  = "rms.DUAL_LOGIN_ENABLED";
 
+   // 자동 로그아웃 타임아웃 (단위: 분, 기본값: 10)
+   public static final String RMS_AUTO_LOGOUT_TIMEOUT = "rms.auto.logout.timeout";
+
    // 웹훅 재전송 설정
    public static final String API_WEBHOOK_RETRY_COUNT = "api.webhook.retry_count";
    public static final String API_WEBHOOK_RETRY_TIME  = "api.webhook.retry_time";
diff --git a/src/main/java/com/eactive/eai/rms/common/login/MainController.java b/src/main/java/com/eactive/eai/rms/common/login/MainController.java
index 1471ec8..3994a19 100644
--- a/src/main/java/com/eactive/eai/rms/common/login/MainController.java
+++ b/src/main/java/com/eactive/eai/rms/common/login/MainController.java
@@ -617,6 +617,8 @@ public class MainController implements InterceptorSkipController {
 		menuId = menuId == null ? "" : menuId;
 		model.addAttribute("mainPage", mainPage);
 		model.addAttribute("menuId", menuId);
+		model.addAttribute("autoLogoutTimeout",
+				monitoringContext.getIntProperty(MonitoringContext.RMS_AUTO_LOGOUT_TIMEOUT, 10));
 
 		if (logger.isDebugEnabled()) {
 			logger.debug("CURRENT SERVICE TYPE : " + service);