Induction heating device for mold

A mold induction heating device for induction heating a mold that forms a hollow portion therein, comprising:

• an upper plate that contacts an upper end face of the mold;
• a lower plate that contacts a lower end face of the mold;
• and
• an induction coil that is provided to each plate, and has a voltage applied thereto,
• wherein each of the plates has a generally ring-shaped metal plate body in which is formed a recessed housing portion for housing the induction coil, and a metal cover that closes the recessed housing portion in a state where the induction coil is housed therein,
• a cover placement portion is formed, and
• a plurality of jacket chambers, in which a gas-liquid two phase heating medium is enclosed, are formed in the metal plate body,
• wherein in the jacket chambers, a lower surface of a coil adjacent portion that is adjacent to the induction coil has a portion that is lower than a lower surface of portions other than the coil adjacent portion, and
• the coil adjacent portions of the jacket chambers adjacent to each other are in communication with each other by a communication passage.