Abstract: To present an operating apparatus having features including ease of operation, controllability for preventing misoperation, small size, long life, and ease of assembling. The constitution includes a base unit as skeleton of operation unit, a key operation unit (13) having plural switches disposed at the front side of the base unit, a first design sheet (12) disposed at the front side of the key operation unit (13), printing patterns at positions corresponding to each switch, a display device (11) disposed at the front side of the first design sheet (12), having light function elements (11g) for transmitting and shielding the positions corresponding to the patterns on the first design sheet (12), and a second design sheet (10) disposed at the front side of the display device (11), having windows (10b) at positions corresponding to the light function elements.

Abstract: A high frequency heating apparatus includes an inverter controlling circuit for controlling a semiconductor portion for feeding a low voltage power supply switching element, a low voltage power supply to the controlling circuit, an operation switch for activating the apparatus by a user, and a system controlling portion for controlling a load switching device. The load switching device is adapted to switch on and off at least one of the low voltage power supply leading to the inverter controlling circuit and a rectification circuit.