function.php class custom_walker_nav_menu extends Walker_Nav_Menu { function start_lvl(&$output, $depth = 0, $args = array()) { $output .= '<div class="nav-child"><ul class="nav-child-ul">'; } function end_lvl(&$output, $depth = 0, $args = array()) { $output .= '</ul></div>'; } } wp_nav_menu に以…