diff --git a/frontend/public/app.js b/frontend/public/app.js
index a262f4c..fc86aa7 100755
--- a/frontend/public/app.js
+++ b/frontend/public/app.js
@@ -6,6 +6,7 @@ const loginForm = document.getElementById("login-form");
 const loginMessage = document.getElementById("login-message");
 const logoutBtn = document.getElementById("logout-btn");
 const userBadge = document.getElementById("user-badge");
+const userPopover = document.getElementById("user-popover");
 const currentViewTitle = document.getElementById("current-view-title");
 const navButtons = Array.from(document.querySelectorAll(".header-center [data-view]"));
 const organizationFrame = document.getElementById("organization-frame");
@@ -37,6 +38,14 @@ function clearSession() {
   sessionStorage.removeItem(sessionKey);
 }
 
+function hideUserPopover() {
+  userPopover?.classList.add("hidden");
+}
+
+function toggleUserPopover() {
+  userPopover?.classList.toggle("hidden");
+}
+
 function setActiveView(view) {
   const previousView = currentView;
   currentView = view in viewLabels ? view : "organization";
@@ -71,8 +80,29 @@ function renderAuth() {
   dashboardPanel.classList.toggle("hidden", !authenticated);
   if (authenticated) {
     const displayName = session.user.display_name || "접속자";
-    userBadge.innerHTML = `<span class="user-chip-icon">◎</span><span class="user-chip-text"><strong>${displayName}</strong><em>-</em></span>`;
+    const rank = "-";
+    userBadge.innerHTML = `<span class="user-chip-icon">◎</span><span class="user-chip-text"><strong>${displayName}</strong><em>${rank}</em></span>`;
     userBadge.title = `${displayName} / -`;
+    if (userPopover) {
+      userPopover.innerHTML = `
+        <div class="user-popover-row">
+          <span class="user-popover-label">이름</span>
+          <strong>${displayName}</strong>
+        </div>
+        <div class="user-popover-row">
+          <span class="user-popover-label">직급</span>
+          <span>${rank}</span>
+        </div>
+        <div class="user-popover-row">
+          <span class="user-popover-label">권한</span>
+          <span>${session.user.role || "-"}</span>
+        </div>
+        <div class="user-popover-row">
+          <span class="user-popover-label">아이디</span>
+          <span>${session.user.username || "-"}</span>
+        </div>
+      `;
+    }
   }
 }
 
@@ -100,15 +130,28 @@ if (loginForm) {
 if (logoutBtn) {
   logoutBtn.addEventListener("click", () => {
     clearSession();
+    hideUserPopover();
     renderAuth();
   });
 }
 
+if (userBadge) {
+  userBadge.addEventListener("click", (event) => {
+    event.stopPropagation();
+    toggleUserPopover();
+  });
+}
+
 navButtons.forEach((button) => {
   button.addEventListener("click", () => {
+    hideUserPopover();
     setActiveView(button.dataset.view || "organization");
   });
 });
 
+document.addEventListener("click", () => {
+  hideUserPopover();
+});
+
 setActiveView(currentView);
 renderAuth();
diff --git a/frontend/public/index.html b/frontend/public/index.html
index 2c1b438..07b37f5 100644
--- a/frontend/public/index.html
+++ b/frontend/public/index.html
@@ -51,6 +51,7 @@
 
       <div class="header-actions">
         <button id="user-badge" class="ghost-button ghost-button-soft user-chip" type="button"></button>
+        <div id="user-popover" class="user-popover hidden"></div>
         <button id="logout-btn" class="ghost-button icon-button" type="button" title="로그아웃" aria-label="로그아웃">
           <svg viewBox="0 0 24 24" aria-hidden="true">
             <path d="M15 3h-4a2 2 0 0 0-2 2v3" />
diff --git a/frontend/public/styles.css b/frontend/public/styles.css
index dfa122f..a6b4c60 100644
--- a/frontend/public/styles.css
+++ b/frontend/public/styles.css
@@ -230,6 +230,7 @@
   display: flex;
   align-items: center;
   gap: 6px;
+  position: relative;
 }
 
 .ghost-button {
@@ -252,6 +253,7 @@
   align-items: center;
   gap: 8px;
   padding: 0 10px;
+  cursor: pointer;
 }
 
 .user-chip-icon {
@@ -305,6 +307,39 @@
   stroke-linejoin: round;
 }
 
+.user-popover {
+  position: absolute;
+  top: calc(100% + 10px);
+  right: 42px;
+  min-width: 220px;
+  padding: 14px;
+  border: 1px solid #dbe2ea;
+  border-radius: 16px;
+  background: rgba(255, 255, 255, 0.96);
+  box-shadow: 0 18px 36px rgba(15, 23, 42, 0.14);
+  backdrop-filter: blur(12px);
+  z-index: 30;
+}
+
+.user-popover-row {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  gap: 16px;
+  font-size: 12px;
+  padding: 6px 0;
+  color: var(--color-text);
+}
+
+.user-popover-row + .user-popover-row {
+  border-top: 1px solid #eef2f7;
+}
+
+.user-popover-label {
+  color: var(--color-text-muted);
+  font-weight: 700;
+}
+
 .dashboard-main {
   flex: 1;
   min-height: calc(100vh - 68px);