Heating coil for high-frequency heater

A heating coil used for a high-frequency heater configured to heat a material to be worked using electromagnetic induction by a high-frequency current, wherein

• the heating coil for a high-frequency heater is integrally formed by a modeling method of repeating laying, melting, solidifying, and laminating of a powder containing a conductive material based on three-dimensional data, or a modeling method of laminating a melted conductive material based on three-dimensional data, and
• the heating coil comprises:
• a pair of plate-shaped grounding portions for contact with an electrode through which a high-frequency current is flowed;
• a pair of plate-shaped supporting portions disposed to be perpendicular to the respective grounding portions;
• and
• a sequence of circumferential heating unit disposed to connect distal ends of the supporting portions to one another, wherein
• a cooling medium flow-down path for flowing down a medium for cooling is formed inside each of the supporting portions, and the cooling medium flow-down path is communicated with a cooling medium flow-down path formed inside the heating unit, and
• a portion other than a forming portion of the cooling medium flow-down path in each of the supporting portion is thinner than the forming portion of the cooling medium flow-down path.