Hi @daisuke
Are you returning a single or multiple value?
As per the docs
If it’s a single value, use:
<p>Color: <?php the_field('color'); ?></p>
If it’s a multiple value, use:
<?php
$colors = get_field( 'color' );
// Create a comma-separated list from selected values.
if( $colors ): ?>
<p>Color: <?php echo implode( ', ', $colors ); ?></p>
<?php endif; ?>
Change color to the name of you ACF field, see if that works.