Abstract: A holding part is configured to hold a pillar member and includes first and second holding parts each including a part configured to face an outer circumferential surface of the pillar member from a first side at a position different from and spaced from each other. A lock part is configured to be displaced between lock and unlock positions. The lock position brings the lock part into contact with the outer circumferential surface of the pillar member from a second side at a position between the first and second holding parts. The unlock position releases a contact of the lock part with the outer circumferential surface of the pillar member. When the lock part is at the lock position, the first and second holding parts as well as the lock part hold the pillar member, to thereby lock a position of the holding part with respect to the pillar member.

Abstract: A holding part is configured to hold a pillar member and includes first and second holding parts each including a part configured to face an outer circumferential surface of the pillar member from a first side at a position different from and spaced from each other. A lock part is configured to be displaced between lock and unlock positions. The lock position brings the lock part into contact with the outer circumferential surface of the pillar member from a second side at a position between the first and second holding parts. The unlock position releases a contact of the lock part with the outer circumferential surface of the pillar member. When the lock part is at the lock position, the first and second holding parts as well as the lock part hold the pillar member, to thereby lock a position of the holding part with respect to the pillar member.