To solve a problem that it is a difficult work to dry a hobby material being other than a food material to an optimum, in a microwave heater.

The microwave heater for a hobby exclusive use comprises an inverter power source 9; various sensor functions; and an automatic heating algorithm function, and has a body of 5 kg and less. Thus, anybody amuses himself with a handcraft and a technical art without any failure, and regarding a place, it is lightly movable to a friend home and an outdoor, such as a veranda and a garden, and since a so wide space is not occupied, an effect to spread a utilizing range is produced.