diff --git a/app/views/open_source_projects/_show_bug.html.erb b/app/views/open_source_projects/_show_bug.html.erb
index 678209813..adccff837 100644
--- a/app/views/open_source_projects/_show_bug.html.erb
+++ b/app/views/open_source_projects/_show_bug.html.erb
@@ -18,7 +18,7 @@
 						<% if topic.url.nil? || topic.url == '' %>
 						<%= link_to h(topic.subject), open_source_project_relative_memo_path(open_source_project, topic) %>
 						<% else %>
-						<%= link_to h(topic.subject), topic.url %>
+						<%= link_to h(topic.subject), topic.url, :target => '_blank' %>
 						<% end %></td>
 					<td align="right" rowspan="3">
 					<table class="borad-count">
diff --git a/app/views/open_source_projects/_show_topics.html.erb b/app/views/open_source_projects/_show_topics.html.erb
index 1a16f5282..db25b444d 100644
--- a/app/views/open_source_projects/_show_topics.html.erb
+++ b/app/views/open_source_projects/_show_topics.html.erb
@@ -26,7 +26,7 @@
         <div class="li_list" style="margin-top:10px;margin-left:10px">
           <ul style="list-style-type: square;">
           	<% @bugs.each do |bug| %>
-          	<li><span class="li_time">>[<%= show_description(bug, open_source_project) %>]</span><%= link_to bug.subject, bug.url %></li>
+          	<li><span class="li_time">>[<%= show_description(bug, open_source_project) %>]</span><%= link_to bug.subject, bug.url, :target => '_blank' %></li>
           	<% end %>
           </ul>
         </div>