Index: branches/version-2_4-dev/data/class/pages/entry/LC_Page_Entry.php
===================================================================
--- branches/version-2_4-dev/data/class/pages/entry/LC_Page_Entry.php	(revision 18699)
+++ branches/version-2_4-dev/data/class/pages/entry/LC_Page_Entry.php	(revision 18739)
@@ -731,5 +731,5 @@
             $array["email"] = strtolower($array["email"]);
             $objQuery = new SC_Query();
-            $arrRet = $objQuery->select("email, update_date, del_flg", "dtb_customer","email = ? ORDER BY del_flg", array($array["email"]));
+            $arrRet = $objQuery->select("email, update_date, del_flg", "dtb_customer","email = ? OR email_mobile = ? ORDER BY del_flg", array($array["email"], $array["email"]));
 
             if(count($arrRet) > 0) {
Index: branches/version-2_4-dev/data/class/pages/mypage/LC_Page_Mypage_Change.php
===================================================================
--- branches/version-2_4-dev/data/class/pages/mypage/LC_Page_Mypage_Change.php	(revision 18699)
+++ branches/version-2_4-dev/data/class/pages/mypage/LC_Page_Mypage_Change.php	(revision 18739)
@@ -445,6 +445,6 @@
 
                 $email_cnt = $this->objQuery->count("dtb_customer",
-                                 "del_flg=0 AND " . $mailType . "= ?",
-                                  array($this->arrForm[$mailType]));
+                                 "del_flg=0 AND (email = ? OR email_mobile = ?) ",
+                                  array($this->arrForm[$mailType], $this->arrForm[$mailType]));
                 if ($email_cnt > 0){
                     $arrMailType2[$mailType] = false;
Index: branches/version-2_4-dev/data/class/pages/admin/customer/LC_Page_Admin_Customer_Edit.php
===================================================================
--- branches/version-2_4-dev/data/class/pages/admin/customer/LC_Page_Admin_Customer_Edit.php	(revision 18699)
+++ branches/version-2_4-dev/data/class/pages/admin/customer/LC_Page_Admin_Customer_Edit.php	(revision 18739)
@@ -290,7 +290,7 @@
         if (strlen($array["email"]) > 0) {
             $array['email'] = strtolower($array['email']);
-            $sql = "SELECT customer_id FROM dtb_customer WHERE email ILIKE ? escape '#' AND (status = 1 OR status = 2) AND del_flg = 0 AND customer_id <> ?";
+            $sql = "SELECT customer_id FROM dtb_customer WHERE (email ILIKE ? escape '#' OR email_mobile ILIKE ? escape '#') AND (status = 1 OR status = 2) AND del_flg = 0 AND customer_id <> ?";
             $checkMail = ereg_replace( "_", "#_", $array["email"]);
-            $result = $this->objConn->getAll($sql, array($checkMail, $array["customer_id"]));
+            $result = $this->objConn->getAll($sql, array($checkMail, $checkMail, $array["customer_id"]));
             if (count($result) > 0) {
                 $objErr->arrErr["email"] .= "※ すでに登録されているメールアドレスです。";
@@ -302,7 +302,7 @@
         if (strlen($array["email_mobile"]) > 0) {
             $array['email_mobile'] = strtolower($array['email_mobile']);
-            $sql = "SELECT customer_id FROM dtb_customer WHERE email_mobile ILIKE ? escape '#' AND (status = 1 OR status = 2) AND del_flg = 0 AND customer_id <> ?";
+            $sql = "SELECT customer_id FROM dtb_customer WHERE (email ILIKE ? escape '#' OR email_mobile ILIKE ? escape '#') AND (status = 1 OR status = 2) AND del_flg = 0 AND customer_id <> ?";
             $checkMail = ereg_replace( "_", "#_", $array["email_mobile"]);
-            $result = $this->objConn->getAll($sql, array($checkMail, $array["customer_id"]));
+            $result = $this->objConn->getAll($sql, array($checkMail, $checkMail, $array["customer_id"]));
             if (count($result) > 0) {
                 $objErr->arrErr["email_mobile"] .= "※ すでに登録されているメールアドレス(モバイル)です。";