To secure safety of execution work when a ring shape member for piping support is to be closed by holding the bolt by means of fitting a friction member to the bolt end from the opposite side of the head of the bolt to be tightened and tighten the bolt end with a nut.

A semi-circle arch sandwiching section including a hinge is formed in the intermediate part of a ring shape member 1 for piping support and a fastening part 3 is formed on the upper end of the sandwiching section. When the semi-circle arch sandwiching section is to be closed by tightening the fastening part 3 with a bolt, a bolt end 4 is tightened with a nut 5 with the bolt part, which is fitted for fastening purpose, held to prevent it from coming off and falling off by means of fitting a frictiom member such as an 0 ring 6 to a bolt end 4 from the opposite side of a head part 2 of the bolt to be tightened. Thus safety of execution work can be secured.