INDUCTION HEATING COIL AND INDUCTION HEATING DEVICE

To provide an induction heating coil capable of inducing and heating an umbrella portion of a workpiece almost uniformly.SOLUTION: An induction heating coil 2 includes a first side portion 30, a second side portion 32, and a pair of third side portions 34 and 36. The first side portion 30 has a first protrusion 40 projecting toward the second side portion 32. The second side portion 32 has a recess 50 arranged to face the first protrusion 40. When a workpiece 4 is induced and heated, the first protrusion 40 is arranged to face a central portion 60 on the tip surface 8a of the umbrella portion 8, and each of the third side portions 34 and 36 is arranged to face the outer peripheral portion of the tip surface 8a of the umbrella portion 8, and the recess 50 is arranged to face the vicinity of the boundary portion 62 between the umbrella portion 8 and a shaft portion 6.SELECTED DRAWING: Figure 6 【課題】ワークの傘部をほぼ均一に誘導加熱することができる誘導加熱コイルを提供する。【解決手段】誘導加熱コイル２は、第１の辺部３０と、第２の辺部３２と、一対の第３の辺部３４，３６とを備える。第１の辺部３０は、第２の辺部３２に向けて突出する第１の突部４０を有する。第２の辺部３２は、第１の突部４０に対向して配置された凹部５０を有する。ワーク４を誘導加熱する際には、第１の突部４０は、傘部８の先端面８ａにおける中央部６０に対向して配置され、且つ、一対の第３の辺部３４，３６の各々は、傘部８の先端面８ａにおける外周部に対向して配置され、且つ、凹部５０は、傘部８と軸部６との境界部６２近傍に対向して配置される。【選択図】図６