$obj = get_post_type_object( 'post' ); echo $obj->labels->singular_name; 技術的には、上記コードは下記と同じです: global $wp_post_types; $obj = $wp_post_types['post']; echo $obj->labels->singular_name; print_r( $obj ) を実行すると例えば次のような値が返されます: stdClass Object ( [labels] => stdClass Object ( [name] => Posts [singular_name] => Post [add_new] => Add New [add_new_item] => Add New Post [edit_item] => Edit Post [new_item] =>