diff --git a/lambda/admin_portal/static/links.html b/lambda/admin_portal/static/links.html
index 23af538..f953bfa 100644
--- a/lambda/admin_portal/static/links.html
+++ b/lambda/admin_portal/static/links.html
@@ -241,8 +241,8 @@ <h5 class="modal-title" id="createLinkModalLabel">
                                     <div class="col-md-6 mb-3">
                                         <label for="linkSlug" class="form-label">Slug <span class="text-danger">*</span></label>
                                         <input type="text" class="form-control" id="linkSlug" name="link_slug" required
-                                               pattern="[a-zA-Z0-9_\-]+" title="英数字、ハイフン、アンダースコアのみ使用可能">
-                                        <div class="form-text">英数字、ハイフン、アンダースコアのみ使用可能</div>
+                                               pattern="[a-zA-Z0-9_\-/]+" title="英数字、ハイフン、アンダースコア、スラッシュのみ使用可能">
+                                        <div class="form-text">英数字、ハイフン、アンダースコア、スラッシュのみ使用可能</div>
                                     </div>
 
                                     <!-- HTTP Status -->
@@ -522,7 +522,7 @@ <h5 class="modal-title" id="editLinkModalLabel">
                     e.stopPropagation();
 
                     const slugInput = document.getElementById('linkSlug');
-                    const slugPattern = /^[a-zA-Z0-9_-]+$/;
+                    const slugPattern = /^[a-zA-Z0-9_\-/]+$/;
 
                     if (!slugInput.value) {
                         alert('Slugを入力してください。');
@@ -530,7 +530,7 @@ <h5 class="modal-title" id="editLinkModalLabel">
                     }
 
                     if (!slugPattern.test(slugInput.value)) {
-                        alert('Slugは英数字、ハイフン、アンダースコアのみ使用可能です。');
+                        alert('Slugは英数字、ハイフン、アンダースコア、スラッシュのみ使用可能です。');
                         return;
                     }
 
diff --git a/lambda/layers/common/python/ddb/models/delibird_link.py b/lambda/layers/common/python/ddb/models/delibird_link.py
index 0c2cc41..80dae1a 100644
--- a/lambda/layers/common/python/ddb/models/delibird_link.py
+++ b/lambda/layers/common/python/ddb/models/delibird_link.py
@@ -1,6 +1,7 @@
 import json
 import logging
 import os
+import re
 from dataclasses import dataclass
 from datetime import datetime
 from enum import Enum, auto
@@ -18,6 +19,8 @@
 from util.logger_util import setup_logger
 
 _REGION = os.environ["AWS_REGION"]
+_MAX_SLUG_LENGTH = 255
+_SLUG_PATTERN = re.compile(r'^[a-zA-Z0-9\-_]+(?:/[a-zA-Z0-9\-_]+)*$', re.ASCII)
 
 logger = setup_logger("delibird.link_table", logging.INFO)
 
@@ -55,11 +58,27 @@ class DelibirdLink:
 
     max_uses: Optional[int] = None
 
+    @staticmethod
+    def _validation(link: "DelibirdLink") -> None:
+        # domain
+        if not link.domain:
+            raise ValueError("Domain is required.")
+        # slug
+        if (not (slug := link.link_slug)) or (len(slug) > _MAX_SLUG_LENGTH) or (not _SLUG_PATTERN.fullmatch(slug)):
+            raise ValueError(f"Invalid slug: {slug}")
+        # origin
+        if not link.link_origin:
+            raise ValueError("Origin is required.")
+        # status
+        if not link.status.is_redirection:
+            raise ValueError(f"Status code {link.status} is not a redirection status.")
+
     def __post_init__(self):
         if self.query_whitelist is None:
             self.query_whitelist = set()
         if self.tag is None:
             self.tag = set()
+        DelibirdLink._validation(self)
 
     def check_active(self) -> tuple[bool, Optional[DelibirdLinkInactiveReason]]:
         if self.disabled:
diff --git a/s3/css/admin-portal.css b/s3/css/admin-portal.css
index 674ca4f..7d26cb9 100644
--- a/s3/css/admin-portal.css
+++ b/s3/css/admin-portal.css
@@ -64,6 +64,10 @@
     max-width: 50px;
 }
 
+.tooltip-inner {
+    max-width: 400px;
+}
+
 .table-responsive {
     font-size: 0.9rem;
 }