diff --git a/mobile/skin/member/basic/register_form.skin.php b/mobile/skin/member/basic/register_form.skin.php
index 555487936..99d6b300e 100644
--- a/mobile/skin/member/basic/register_form.skin.php
+++ b/mobile/skin/member/basic/register_form.skin.php
@@ -31,17 +31,17 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
             <th scope="row"><label for="reg_mb_id">아이디<strong class="sound_only">필수</strong></label></th>
             <td>
                 <span class="frm_info">영문자, 숫자, _ 만 입력 가능. 최소 3자이상 입력하세요.</span>
-                <input type="text" name="mb_id" value="<?php echo $member['mb_id'] ?>" id="reg_mb_id" class="frm_input minlength=3 <?php echo $required ?> <?php echo $readonly ?>" maxlength="20" <?php echo $required ?> <?php echo $readonly ?>>
+                <input type="text" name="mb_id" value="<?php echo $member['mb_id'] ?>" id="reg_mb_id" class="frm_input minlength=3 <?php echo $required ?> <?php echo $readonly ?>" minlength="3" maxlength="20" <?php echo $required ?> <?php echo $readonly ?>>
                 <span id="msg_mb_id"></span>
             </td>
         </tr>
         <tr>
             <th scope="row"><label for="reg_mb_password">비밀번호<strong class="sound_only">필수</strong></label></th>
-            <td><input type="password" name="mb_password" id="reg_mb_password" class="frm_input minlength=3 <?php echo $required ?>" maxlength="20" <?php echo $required ?>></td>
+            <td><input type="password" name="mb_password" id="reg_mb_password" class="frm_input minlength=3 <?php echo $required ?>" minlength="3" maxlength="20" <?php echo $required ?>></td>
         </tr>
         <tr>
             <th scope="row"><label for="reg_mb_password_re">비밀번호 확인<strong class="sound_only">필수</strong></label></th>
-            <td><input type="password" name="mb_password_re" id="reg_mb_password_re" class="frm_input minlength=3 <?php echo $required ?>" maxlength="20" <?php echo $required ?>></td>
+            <td><input type="password" name="mb_password_re" id="reg_mb_password_re" class="frm_input minlength=3 <?php echo $required ?>" minlength="3" maxlength="20" <?php echo $required ?>></td>
         </tr>
         </table>
     </div>
diff --git a/skin/member/basic/register_form.skin.php b/skin/member/basic/register_form.skin.php
index 50b4980d1..520c38007 100644
--- a/skin/member/basic/register_form.skin.php
+++ b/skin/member/basic/register_form.skin.php
@@ -34,17 +34,17 @@ add_stylesheet('<link rel="stylesheet" href="'.$member_skin_url.'/style.css">',
             <th scope="row"><label for="reg_mb_id">아이디<strong class="sound_only">필수</strong></label></th>
             <td>
                 <span class="frm_info">영문자, 숫자, _ 만 입력 가능. 최소 3자이상 입력하세요.</span>
-                <input type="text" name="mb_id" value="<?php echo $member['mb_id'] ?>" id="reg_mb_id" <?php echo $required ?> <?php echo $readonly ?> class="frm_input minlength=3 <?php echo $required ?> <?php echo $readonly ?>" maxlength="20">
+                <input type="text" name="mb_id" value="<?php echo $member['mb_id'] ?>" id="reg_mb_id" <?php echo $required ?> <?php echo $readonly ?> class="frm_input minlength=3 <?php echo $required ?> <?php echo $readonly ?>" minlength="3" maxlength="20">
                 <span id="msg_mb_id"></span>
             </td>
         </tr>
         <tr>
             <th scope="row"><label for="reg_mb_password">비밀번호<strong class="sound_only">필수</strong></label></th>
-            <td><input type="password" name="mb_password" id="reg_mb_password" <?php echo $required ?> class="frm_input minlength=3 <?php echo $required ?>" maxlength="20"></td>
+            <td><input type="password" name="mb_password" id="reg_mb_password" <?php echo $required ?> class="frm_input minlength=3 <?php echo $required ?>" minlength="3" maxlength="20"></td>
         </tr>
         <tr>
             <th scope="row"><label for="reg_mb_password_re">비밀번호 확인<strong class="sound_only">필수</strong></label></th>
-            <td><input type="password" name="mb_password_re" id="reg_mb_password_re" <?php echo $required ?> class="frm_input minlength=3 <?php echo $required ?>" maxlength="20"></td>
+            <td><input type="password" name="mb_password_re" id="reg_mb_password_re" <?php echo $required ?> class="frm_input minlength=3 <?php echo $required ?>" minlength="3" maxlength="20"></td>
         </tr>
         </tbody>
         </table>