PURPOSE: To reduce the number of the component parts of an oscillating device, by driving a rotary body directly and rotationally with a synchronous motor.

CONSTITUTION: In an electric stove 1 using the oscillating device of a rotary body, the main unit case 4 of the rotary body provided with a sheathed heater 2 as a heat generating unit and a reflecting plate 3 is rotatably supported with a cylindrical stand 5. In the main unit case 4, a rotary shaft 7 is penetrated through the central section of a base plate 6, and on the stand 5, a bearing section 10 for supporting the rotary shaft 7 pivotally via a bearing 9 on the central section of the upper wall surface 8 is formed. In the internal section of the stand 5, a synchronous motor 12 for driving the main unit case 4 rotationally is set. Besides, on the upper wall surface 8, a first - a second stand stoppers 16-17 for regulating the rotational range of the main unit case 4 are formed. Then, the main unit case 4 is driven directly and rotationally by the synchronous motor 12, and when the case 4 is rotated dy a specified angle, then the rotational direction of the synchronous motor is changed.