Patent ID: 7946002

Claim:
A connecting device including: a connecting device main body having a neck portion and an engagement head which is expanded in an outward direction from a center of an axis line such that a diameter of the engagement head can be reduced, the engagement head being provided at a front end of the neck portion; and a belt attaching member connected to the connecting device main body rotatably around the neck portion, the belt attaching member containing a through hole having a small-diameter hole portion with a smaller diameter than the diameter of the engagement head and a large-diameter hole portion which is connected to the small-diameter hole portion via a stepped portion and has a larger diameter than the diameter of the engagement head, and further including a ring-like member which is accommodated in the large-diameter of the through hole to allow the neck portion to be inserted therethrough, the ring-like member having a cylindrical wall portion having an outside diameter equal to an inside diameter of the large-diameter hole portion and an inside diameter which is able to house the engagement head when the engagement head is expanded in diameter, and an engaging portion which is provided at a bottom end of the cylindrical wall portion and extended toward a center thereof and which the engagement head is engaged with, smaller than the outside diameter of the engagement head when expanded in diameter; and wherein the ring-like member has a plurality of ribs extending radially from a center of the ring-like member toward an inner peripheral surface of the wall portion.