PURPOSE: To easily disassemble a door and to regulate a choke member in a switching door for a high-frequency heater containing the choke member for sealing a radio wave.

CONSTITUTION: Many choke members 30 for sealing a radio wave, each having a U-shaped part 31 at an end are stood perpendicularly along an outer peripheral edge of a square door body 26. On the other hand, a frame 27 for covering the members 30 has four sidewalls 27a for forming an outer surface of a door, and many connecting members 32 each having a pawl 33 to be detachably engaged with the part 31. Only one 27a of the four sidewalls of the frame 27 is separated from the right and left sidewalls to be freely deformed easily. Accordingly, the deforming force of the one sidewall 27a is applied to the member 32, and the one sidewall 27a is strongly separated from the body 26 to bend the member 32, thereby removing the pawl 33 from the part 31.