Custom field only on custom post type?

Sure, just check the post type of the post you’re on.

global $post; // make sure $post is available
if( get_post_type( $post ) == 'your_custom_post_type's_name' ) {
    add_meta_box( ... );
}

UPDATE: I think the $post variable might not have been getting passed to get_post_type.

Related Posts:

  1. Best way to use Category & Custom Fields?
  2. Pre_get_posts comparison with custom field doesn’t work
  3. Delete custom post type metadata without deleting the post in admin area
  4. Retrieving custom post type fields without a post
  5. Best way to insert a js script in the header with custom fields and CPT
  6. Creating connections programmatically with common fields on CPT’s
  7. Amend posts using wp_insert_post
  8. Custom Fields as Post Type Options
  9. How can I get the $key / $value pairs of custom fields that were added via 3rd party plugins or themes?
  10. How to delete comma from the end of results? [closed]
  11. How to use TOC with ACF?
  12. Publish post and create additional posts with same content
  13. How to enable the user to add value through the admin panel?
  14. Get month and day from a Date Picker custom field
  15. Two plugins sharing the same custom post type registration
  16. custom fields not showing before get_header
  17. Creating multiple CPT posts from one Gravity form
  18. How to add post reference field to a plugin?
  19. Generate slug and meta data if meta field is empty
  20. pre_get_posts with multiple post types AND a meta_key
  21. Search form to find custom meta box generated data
  22. Calling specific page with wp query
  23. Custom Info Box at end of posts?
  24. How to get past and upcoming post by defining date in custom field?
  25. How to stop wp_query searching pages as well as the specified CPT
  26. Converting a checkbox filter for custom fields to a dropdown
  27. Post content is cleared when updating
  28. How do I add custom fields to posts without having to manually add everytime I post?
  29. Function not pulling image or text from custom post type
  30. Display Custom Post if custom field is marked
  31. Default custom column to off
  32. predefined custom field on registration page
  33. How to display custom post type ordered by a custom field date
  34. Selecting posts older than the current Unix epoch timestamp
  35. Unable to get the upcoming events for custom post
  36. Order Custom Posts by Several Fields
  37. one get_posts to return a number of custom posts for each meta value
  38. Show Custom Post Type taxonomy term that matches custom field
  39. display some fields in custom post backend
  40. Is it possible to make one of two custom fields in Custom Post Type UI Required but not the other?
  41. Query Distinct Taxonomies of Custom Post Type
  42. Custom Post Type as invoice or order template
  43. Setting a custom $query->query_vars[‘meta_key’] breaks the WordPress menu
  44. Custom field totals
  45. custom taxonomies are not showing up in get_taxonomies
  46. WP_Query and two custom fields returns no posts
  47. Forms with multiple element types using custom post types
  48. Displaying database table in backend of wordpress
  49. WP_Query get posts where post_name is empty
  50. Is it good practice to search for custom posts based on custom field values?
  51. Custom post type with custom fields enabled, is there a way to set a default group of fileds?
  52. Storing/querying custom date data
  53. Custom post type won’t take my custom fields
  54. Order by custom field attribute
  55. Get result from Custom Field in Custom Post type
  56. If i have custom post type with 5 custom fields do i have to create a new loop to reference each one?
  57. Make each Value of custom field show related posts when clicked
  58. How to display Multi Checkbos select Custom Field on the post?
  59. I want to split this into two functions
  60. custom field suit new post with in custom fields
  61. Repeatable Custom Field for Media Upload
  62. Show a custom field instead of username in the backend author area
  63. Filter CPT based on meta box value using Flexible Posts widget?
  64. Echo custom field value
  65. Select Menu for Custom post Type does not save
  66. Customizing the display of custom post types
  67. Repeatable custom meta select boxes
  68. Create shortcode for list of custom post titles with custom fields alongside
  69. Display custom posts in checkbox list
  70. Display posts order by custom post in a dropdown menu
  71. Advanced search form with filters for custom taxonomies and custom fields
  72. Query recent posts by author
  73. 404 on Pages for Custom Post Type & Query_Posts
  74. Custom post type and custom taxonomy archive inaccessible
  75. How to insert post into a page?
  76. Textarea type on one field custom add_meta_box?
  77. How to show animal lineage/pedigree in WordPress?
  78. How can i display on front page a movie that is atached in a post type
  79. WP_Query arguments: Loop through custom post type – get all entries except excluded meta_key?
  80. Rewriting a page driven by custom fields to populate a page dynamically, like posts
  81. loop through custom post-type with two meta_keys
  82. How to store datetime from custom meta box so that it can be sorted by
  83. Extending a CPT by Created by another plugin
  84. Custom meta box includes
  85. Querying meta values within an array
  86. Creating entries with image attachements within posts and managing them in a list
  87. Types plugin isn’t compatible with my custom post type
  88. How to Create a Frontend Html-list Editable in the Backend?
  89. Allow authors to create article image
  90. Radom post image/link based on custom taxonomy
  91. How to grab data (titles, thumbnails and custom fields) from multiple posts to populate a new array efficiently?
  92. Custom Post Type + Custom Meta Query Not Showing 2012 Posts
  93. Custom Post Meta on a Different Page?
  94. Calling Custom Post Meta
  95. Adding a custom “Add Custom Field” button to Custom Meta boxes
  96. preselected custom fields in custom post type
  97. how to implement club post type
  98. Filter Custom post type by another Custom post type
  99. Show Posts in Vertical Tabs with Scrollbar
  100. How do I filter a custom post type loop by a field?
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)