To provide a method of manufacturing an induction heating coil used for induction hardening of the crankshaft for an engine and an induction heating coil, prevented in deterioration of the product quality with excellent in product service life.

The method of manufacturing an induction heating coil includes: a first processing step S100 of boring groove parts 80a, etc. having a predetermined shape in a plurality of preforms 60-64 made of a base material of an induction heating coil body 10 to form a cooling water passage 5 as a whole by combining the preforms 60-64 on joining surfaces 60a, etc.; a joining step S110 of forming one molded body 6 by respectively combining the preforms 60-64 having the groove parts 80a, etc. bored in the first processing step S100 on predetermined joining surfaces 60a, etc. and joining the joining surfaces 60a, etc. of the preforms 60-64 by solid-phase welding; and a second processing step S120 of shaving the induction heating coil body 10 based on the shape of the groove parts 80a, etc. with respect to the molded body 6 joined in the joining step S110.

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