To provide an accuracy inspecting device for a bead setter for a tire forming machine capable of accurately measuring the inclination of a discontinuous surface of a bead setter, simultaneously measuring the inclination of the surface and split accuracy of left and right bead setting rings, and repeatedly performing accurate measurements whereby it is possible to improve the efficiency of inspection work.

This accuracy inspecting device for a bead setter comprises a base block 19 detachably provided at an axial reference position on a shaping drum shaft 2 of a tire forming machine, a plurality of arms 20 radially protruding from the base block 19 relative to the drum shaft 2, and a senser 22 provided in the vicinity of a distal end of the arm 20 for detecting a distance from the reference position of respective setting rings 7a, 7b, 7c, 7d of the bead setter, wherein the split accuracy of the setting rings 7a, 7b, 7c, 7d from the center of the shaping drum and inclination of the surface thereof is measured based on measured values by a senser 22.