Retention mechanism and insertion equipment

Holding mechanism (500) is a bent state in which a portion of the insertion opening guide member exposed from (36a) to the outside (300) (303) is bent with respect to the insertion opening (36a), the guide member (300 ) having an opening for inserting the (530). Holding mechanism (500) is arranged by a part of the holding mechanism (500) is cut in the radial direction of the central axis of the insertion opening (36a), the insertion opening guide member (300) (36a) a gap portion having a cut edge that leads to the opening (530) in a (571) from. Holding mechanism (500) is arranged in the radial direction, the center of the portion (303) so as to maintain the bent state, with each other insertion opening the guide member inserted through opening (530) (300) (36a) position in the axial direction has a locking mechanism for locking (550) to each other in two different locations.