To make an operation for connecting a coupler fitted to the tip end part of hardening liquid supplying tube, etc., to a tank side supplying tube unnecessary, when an induction hardening coil body connected to a transformer is replaced with another one according to the kind of a work.

An induction hardening apparatus is provided with: a transformer 100 wherein an output side leading block 120 as the output terminal of a secondary side coil 110 for outputting high frequency current is arranged at its lower part side; and an induction hardening coil body 200 which has an input side leading block 210 being equipment detachably connected to the lower part of the output side leading block 120 of the transformer 100 and being the input terminal of the high frequency current, heating coils 220R, L for carrying out induction heating of the work W, and cooling jackets 230R, L. A water-supplying tube 240 and a water-draining tube 250 of the cooling water for heat-radiation to be supplied to the heating coils 220R, L, are introduced from the transformer 100 side to the induction hardening coil body 200 side through the inner parts of the outside leading block 120 and the input side leading block 210.

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