The invention provides a high frequency heating apparatus capable of preventing thermal destruction, prolonging the cooking speed, and increasing the cooking speed by efficiently cooling an IGBT and a high-voltage transformer of an inverter power source. A holding stand (26) to hold an inverter comprises a holding unit (39) to hold a power supply unit (25) and an air guide unit (40 to cool electric components of the power supply unit (25). The holding stand covers the power supply unit, and cools mainly a semi-conductor switching element and a high-voltage transformer of the power supply unitin a concentrated manner. Since a semi-conductor (34) and the high-voltage transformer (37) can be sufficiently exposed to fast cooling air, and efficiently cooled, thermal destruction caused by switching losses of the semi-conductor switching element can be prevented. In addition, the temperature rise in the winding of the high-voltage transformer can be suppressed. The high-output time can be prolonged and the cooking speed can be increased thereby.