diff --git a/controller/checklist/UtilForChecklist.php b/controller/checklist/UtilForChecklist.php
index da929fb..1fbce37 100644
--- a/controller/checklist/UtilForChecklist.php
+++ b/controller/checklist/UtilForChecklist.php
@@ -24,4 +24,16 @@ public static function getPercentIntoCheckboxes(string $body): int
     return (int)floor($checked / $total * 100);
   }
 
+  /**
+   * adjust content
+   *
+   * @param string $content
+   * @return string
+   */
+  public static function adjustContent(string $content): string
+  {
+    $content = str_replace("'", "\'", $content);
+    return $content;
+  }
+
 }
diff --git a/controller/checklist/add_item.php b/controller/checklist/add_item.php
index 590af30..ff33242 100644
--- a/controller/checklist/add_item.php
+++ b/controller/checklist/add_item.php
@@ -25,6 +25,9 @@
   // set percent into content
   $percent = UtilForChecklist::getPercentIntoCheckboxes($this->post->content);
 
+  // adjust content
+  $content = UtilForChecklist::adjustContent($this->post->content);
+
   // set output
   $output = Controller\Main::add($this, (object)[
     'table' => 'checklist',
@@ -32,7 +35,7 @@
     'data' => (object)[
       'srl' => null,
       'user_srl' => (int)$token->data->user_srl,
-      'content' => $this->post->content,
+      'content' => $content,
       'percent' => $percent,
       'regdate' => isset($this->post->regdate) ? $this->post->regdate : date('Y-m-d H:i:s'),
     ],
diff --git a/controller/checklist/edit_item.php b/controller/checklist/edit_item.php
index 63c6637..c246154 100644
--- a/controller/checklist/edit_item.php
+++ b/controller/checklist/edit_item.php
@@ -35,12 +35,15 @@
     'srl' => $srl,
   ]);
 
+  // adjust content
+  $content = UtilForChecklist::adjustContent($this->post->content);
+
   // set output
   $output = Controller\Main::edit($this, (object)[
     'table' => 'checklist',
     'srl' => $srl,
     'data' => [
-      "content='{$this->post->content}'",
+      "content='{$content}'",
       "percent={$percent}",
     ],
   ]);