<form method='post'>
 
		<div class="image-upload-wrap">
			<div class='image-preview-wrapper'>
				<img id='image-preview-1' src='' height='100'>
			</div>
			<input id="upload_image_button-1" type="button" class="button upload_image_button" value="画像１アップロード" />
			<input type='hidden' name='image1' id='image_attachment_id-1' value='' />
		</div>
 
		<input type="submit" name="submit_image_selector" value="Save" class="button-primary">
	</form>

function my_media_script(){
   wp_enqueue_media();
}
 
add_action( 'wp_enqueue_scripts', 'my_media_script' );

function media_selector_print_scripts() {
 
	$my_saved_attachment_post_id = get_option( 'media_selector_attachment_id', 0 );
 
	?><script type='text/javascript'>
		jQuery( document ).ready( function( $ ) {
			// Uploading files
			var file_frame;
			var wp_media_post_id = wp.media.model.settings.post.id; // Store the old id
			var set_to_post_id = <?php echo $my_saved_attachment_post_id; ?>; // Set this
			jQuery('.upload_image_button').on('click', function( event ){
				event.preventDefault();
				// If the media frame already exists, reopen it.
 
				btn_id = $(this).attr('id');
				btn_no = btn_id.replace('upload_image_button-' , '');
 
				if ( file_frame ) {
					// Set the post ID to what we want
					//file_frame.uploader.uploader.param( 'post_id', set_to_post_id );
					// Open frame
					file_frame.open();
					return;
				} else {
					// Set the wp.media post id so the uploader grabs the ID we want when initialised
					//wp.media.model.settings.post.id = set_to_post_id;
				}
				// Create the media frame.
				file_frame = wp.media.frames.file_frame = wp.media({
					title: 'Select a image to upload',
					button: {
						text: 'Use this image',
					},
					multiple: false	// Set to true to allow multiple files to be selected
				});
				// When an image is selected, run a callback.
				file_frame.on( 'select', function() {
					// We set multiple to false so only get one image from the uploader
					attachment = file_frame.state().get('selection').first().toJSON();
					// Do something with attachment.id and/or attachment.url here
					$( '#image-preview-'+btn_no ).attr( 'src', attachment.sizes.thumbnail.url ).css( 'width', 100 );
					$( '#image_attachment_id-'+btn_no ).val( attachment.id );
					// Restore the main post ID
					//wp.media.model.settings.post.id = wp_media_post_id;
				});
					// Finally, open the modal
					file_frame.open();
			});
 
			// Restore the main ID when the add media button is pressed
			jQuery( 'a.add_media' ).on( 'click', function() {
				//wp.media.model.settings.post.id = wp_media_post_id;
			});
 
		});
 
	</script><?php
}