diff --git a/app/views/bids/_new_homework_form.html.erb b/app/views/bids/_new_homework_form.html.erb
index 16f78491b..7a5f628f9 100644
--- a/app/views/bids/_new_homework_form.html.erb
+++ b/app/views/bids/_new_homework_form.html.erb
@@ -35,7 +35,7 @@
     </li>
     <li class="ml9" id="bid_evaluation_num_li"  style="display: <%= bid.open_anonymous_evaluation == 1 ? 'block' : 'none'%>;">
       <label><span class="c_red">*</span>&nbsp;<%= l(:field_evaluation_num)%>&nbsp;&nbsp;：</label>
-      <input  type="text" name="bid[evaluation_num]" id="bid_evaluation_num"  class="hwork_input02" onkeyup="regex_evaluation_num();" value="<%= bid.evaluation_num%>">
+      <input  type="text" name="bid[evaluation_num]" id="bid_evaluation_num"  class="hwork_input02" onkeyup="regex_evaluation_num();" value="<%= bid.evaluation_num%>" maxlength="3">
       <span><%= l(:label_evaluation_description)%></span>
       <p id="bid_evaluation_num_span" class="c_red" style="padding-left: 90px;"></p>
     </li>