To provide an auxiliary device for an operation inspection of a safety valve, which can perform an operation inspection without removing a safety valve attached to a pressure fluid system and requiring a shut-off valve or a check valve when the safety valve is abutted on a mounting end for the safety valve of the pressure fluid system at a fluid inlet end and tightened in an abutting state by a flange and bolt tightening means.

Provided is the auxiliary device for the operation inspection of the safety valve, which closes the fluid inlet end by being tightened between the fluid inlet end of the safety valve and the mounting end for the safety valve of the pressure fluid system by the flange and bolt tightening means and has a plate part for forming a port where a fluid for the operation inspection of the safety valve is pressed into the fluid inlet end.