diff --git a/index.cgi b/index.cgi
index 4537599a..5ab48079 100644
--- a/index.cgi
+++ b/index.cgi
@@ -147,6 +147,7 @@ sub tagConvert {
   1 while $comm =~ s#&lt;left&gt;(.*?)&lt;/left&gt;\n?#<div class="left">$1</div>#gis;
   1 while $comm =~ s#&lt;center&gt;(.*?)&lt;/center&gt;\n?#<div class="center">$1</div>#gis;
   1 while $comm =~ s#&lt;right&gt;(.*?)&lt;/right&gt;\n?#<div class="right">$1</div>#gis;
+  1 while $comm =~ s#&lt;add-line-spacing&gt;(.*?)&lt;/add-line-spacing&gt;\n?#<div class="add-line-spacing">$1</div>#gis;
   
   1 while $comm =~ s#&lt;h([1-6])&gt;(.*?)&lt;/h\1&gt;\n?#<h$1>$2</h$1>#gis;
   
diff --git a/lib/css/base.css b/lib/css/base.css
index 3bd52a44..649fdebf 100644
--- a/lib/css/base.css
+++ b/lib/css/base.css
@@ -211,6 +211,8 @@ button, .button {
 .left  { text-align: left; }
 .center{ text-align: center; }
 .right { text-align: right; }
+.add-line-spacing { line-height: 2.1; }
+.add-line-spacing ruby { line-height: 2.4; }
 
 img.icon { width: 1em; height: 1em; }
 
diff --git a/lib/css/chat-common.css b/lib/css/chat-common.css
index ae551e7f..8b1be745 100644
--- a/lib/css/chat-common.css
+++ b/lib/css/chat-common.css
@@ -958,6 +958,7 @@ body.rom .input-form { display: none !important; }
 .decoration-buttons .insert-left::before    { content:"\e236"; }
 .decoration-buttons .insert-center::before  { content:"\e234"; }
 .decoration-buttons .insert-right::before   { content:"\e237"; }
+.decoration-buttons .insert-add-line-spacing::before { content:"\ea16"; }
 .decoration-buttons .insert-headline::before{ content:"\f019"; transform: scale(1.55); }
 
 .decoration-buttons .insert-image::before   { content:"\e3f4"; color:#8fd; }
diff --git a/lib/html/room.html b/lib/html/room.html
index 9141f17d..2c282b4a 100644
--- a/lib/html/room.html
+++ b/lib/html/room.html
@@ -106,6 +106,7 @@ <h1><TMPL_VAR title></h1>
             <span data-target="form-comm-main" class="button insert-left"    title="左揃え"></span>
             <span data-target="form-comm-main" class="button insert-center"  title="中央揃え"></span>
             <span data-target="form-comm-main" class="button insert-right"   title="右揃え"></span>
+            <span data-target="form-comm-main" class="button insert-add-line-spacing" title="行送りを大きく"></span>
             
             <span class="button end insert-headline" title="見出し">
               <select data-target="form-comm-main">
@@ -265,6 +266,7 @@ <h2>発言編集</h2>
       <span data-target="rewrite-comm" class="button insert-left"      title="左揃え"></span>
       <span data-target="rewrite-comm" class="button insert-center"    title="中央揃え"></span>
       <span data-target="rewrite-comm" class="button insert-right"     title="右揃え"></span>
+      <span data-target="rewrite-comm" class="button insert-add-line-spacing" title="行送りを大きく"></span>
       
       <span class="button end insert-headline" title="見出し">
         <select data-target="rewrite-comm">
diff --git a/lib/js/chat.js b/lib/js/chat.js
index 8e4b4d25..44f37959 100644
--- a/lib/js/chat.js
+++ b/lib/js/chat.js
@@ -958,6 +958,7 @@ function tagConvert (comm){
       .replace(/&lt;left&gt;(.*?)&lt;\/left&gt;/gis    ,'<div class="left">$1</div>')
       .replace(/&lt;center&gt;(.*?)&lt;\/center&gt;\n?/gis,'<div class="center">$1</div>')
       .replace(/&lt;right&gt;(.*?)&lt;\/right&gt;\n?/gis  ,'<div class="right">$1</div>')
+      .replace(/&lt;add-line-spacing&gt;(.*?)&lt;\/add-line-spacing&gt;\n?/gis  ,'<div class="add-line-spacing">$1</div>')
       .replace(/&lt;h([1-6])&gt;(.*?)&lt;\/h\1&gt;\n?/gis ,'<h$1>$2</h$1>')
       .replace(/((?:^|>)[^<]*?)(https?:\/\/)([^\s\<]+)/gi,'$1<a href="$2$3" target="_blank">$3</a>')
   }
diff --git a/lib/js/ui.js b/lib/js/ui.js
index 8e9be9b2..2e5e9744 100644
--- a/lib/js/ui.js
+++ b/lib/js/ui.js
@@ -1477,6 +1477,9 @@ document.querySelectorAll('.insert-center').forEach(obj => { obj.addEventListene
 document.querySelectorAll('.insert-right').forEach(obj => { obj.addEventListener('click', (e)=>{
   tagInsert(e, '<right>','</right>')
 }); });
+document.querySelectorAll('.insert-add-line-spacing').forEach(obj => { obj.addEventListener('click', (e)=>{
+  tagInsert(e, '<add-line-spacing>','</add-line-spacing>')
+}); });
 document.querySelectorAll('.insert-headline select').forEach(obj => { obj.addEventListener('input', (e)=>{
   const lv = e.target.value;
   if(!lv){ return; }