To provide a simple and small-sized device for performing a creep test of a load sensor wherein a strain gage is stuck on a strain generating piece.

This creep testing tool for performing the creep test of the load sensor wherein the strain gage 40 is stuck on the surface of the strain generating piece 5 has a base 1 having a fixing plane 3 onto which the surface near a fixing end 6 of the strain generating piece 5 is pressed and fixed; a pressurizing mechanism 25 for moving a part near a pressurizing end 21 of the strain generating piece 5 adjustably and relatively to the base 1 by rotation of a screw, to thereby generate bending deformation in the strain generating piece 5; and a pressurizing part stopper 30 having an upper pressing part 36 for pressing the far side from the base near the pressurizing end 21 of the strain generating piece 5, and fixed relatively to the base 1 so that the position can be adjusted.