Method for producing bearing ring and method for producing double row tapered roller bearing

A method for producing a bearing ring of a double row tapered roller bearing, comprising the steps of:

• preparing a formed body constituted of steel and having an outer circumferential surface having an annular groove having a bottom surface to serve as a raceway surface of the bearing ring;
• forming a heated region including the bottom surface of the groove and heated to a temperature of at least an Al point by relatively rotating along a circumferential direction of the groove an induction heating coil arranged to face part of the groove and induction-heating the formed body;
• simultaneously cooling a whole of the heated region to a temperature of not more than an Ms point;
• and
• retaining the formed body in a state where heating is stopped after the step of forming a heated region before the step of cooling,
• in the step of forming a heated region, the induction heating coil being used which has a shape allowing a region of the coil facing the groove and contributing to heating the groove to be included in a single plane.