diff --git a/Config/Migration/1769652195_add_index.php b/Config/Migration/1769652195_add_index.php
new file mode 100644
index 0000000..a0fa47a
--- /dev/null
+++ b/Config/Migration/1769652195_add_index.php
@@ -0,0 +1,63 @@
+<?php
+/**
+ * インデックス追加のみ。
+ *
+ * @package Researchmap\RmNetCommons\Config\Migration
+ */
+class AddIndex1769652195 extends CakeMigration {
+
+/**
+ * Migration description
+ *
+ * @var string
+ */
+	public $description = 'add_index';
+
+/**
+ * Actions to be performed
+ *
+ * @var array $migration
+ */
+	public $migration = array(
+		'up' => array(
+			'create_field' => array(
+				'tags' => array(
+					'indexes' => array(
+						'idx1_p_tags' => array('column' => array('model', 'block_id'), 'unique' => 0),
+					),
+				),
+				'tags_contents' => array(
+					'indexes' => array(
+						'idx1_p_tags_contents' => array('column' => array('tag_id'), 'unique' => 0),
+					),
+				),
+			),
+		),
+		'down' => array(
+			'drop_field' => array(
+				'tags' => array('indexes' => array('idx1_p_tags')),
+				'tags_contents' => array('indexes' => array('idx1_p_tags_contents')),
+			),
+		),
+	);
+
+/**
+ * Before migration callback
+ *
+ * @param string $direction Direction of migration process (up or down)
+ * @return bool Should process continue
+ */
+	public function before($direction) {
+		return true;
+	}
+
+/**
+ * After migration callback
+ *
+ * @param string $direction Direction of migration process (up or down)
+ * @return bool Should process continue
+ */
+	public function after($direction) {
+		return true;
+	}
+}
diff --git a/Config/Schema/schema.php b/Config/Schema/schema.php
index 0818b20..12702b9 100644
--- a/Config/Schema/schema.php
+++ b/Config/Schema/schema.php
@@ -52,7 +52,8 @@ public function after($event = array()) {
 		'modified_user' => array('type' => 'integer', 'null' => true, 'default' => null, 'unsigned' => false, 'comment' => '更新者'),
 		'modified' => array('type' => 'datetime', 'null' => true, 'default' => null, 'comment' => '更新日時'),
 		'indexes' => array(
-			'PRIMARY' => array('column' => 'id', 'unique' => 1)
+			'PRIMARY' => array('column' => 'id', 'unique' => 1),
+			'idx1_p_tags' => array('column' => array('model', 'block_id'), 'unique' => 0)
 		),
 		'tableParameters' => array('charset' => 'utf8', 'collate' => 'utf8_general_ci', 'engine' => 'InnoDB')
 	);
@@ -71,7 +72,8 @@ public function after($event = array()) {
 		'modified' => array('type' => 'datetime', 'null' => true, 'default' => null, 'comment' => '更新日時'),
 		'indexes' => array(
 			'PRIMARY' => array('column' => 'id', 'unique' => 1),
-			'model' => array('column' => array('model', 'content_id'), 'unique' => 0)
+			'model' => array('column' => array('model', 'content_id'), 'unique' => 0),
+			'idx1_p_tags_contents' => array('column' => array('tag_id'), 'unique' => 0)
 		),
 		'tableParameters' => array('charset' => 'utf8', 'collate' => 'utf8_general_ci', 'engine' => 'InnoDB')
 	);