To maintain a good appearance on the front of a mount part.

Plural bayonet pawls 13 are arranged around an optical axis on the mount part 12 at the leading end of a photographic lens 10. A notch 17 and a slide ring 24 into which the bayonet pawl 17 enters in an optical axis direction are arranged on the attachment part 16 at the training end of a hood 11. In the case of connecting, the bayonet pawl 13 is fitted into the notch 17, thereafter; the pawl 13 and the notch 17 are relatively rotated around the optical axis. The slide ring 24 is engaged with the bayonet pawl 13 around the optical axis in accordance with the entry of the bayonet pawl 13. The rotation of the slide ring 24 is checked by the bayonet pawl 13 in accordance with the relative rotation of the bayonet pawl 13 and the notch 17. Then, the front surface 13b of the bayonet pawl 13 is prevented from coming into slide- contact with the slide ring 24, so that the front surface 13b of the mount part 12 is prevented from being scratched.