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<?php
$args = array(
     'post_type' => array('カスタム投稿タイプ名1', 'カスタム投稿タイプ名2'), 
     'posts_per_page' => 5,

); ?>
<?php $my_query = new WP_Query( $args ); ?>
<?php while ( $my_query->have_posts() ) : $my_query->the_post(); ?>
 <h1 class="entry-title"><?php the_title(); ?></h1>
 <?php the_excerpt(); ?>
<a class="more-link" href="<?php the_permalink() ?>">詳しく見る</a>
<?php endwhile; // end of the loop. ?>
<?php wp_reset_postdata(); ?>