To enhance workability of torque setting compared to conventional setting work for torque drivers, by arranging a socket engaging member and a receiving part, on each surface of the polyhedron of a coupling device body.

In coupling device 10 for torque drivers which couples a torque driver tester to a torque driver D where a desired torque value is set, a coupling device body 10' is formed into a polyhedron, and along with it a socket engaging member 11 and a receiving part 12 fitted to the upside of the socket engaging member 11 are arranged on each surface 10a of the polyhedron.