PURPOSE: To simplify the supporting structure, to make the weight light and the cost low without deteriorating the adjusting accuracy by providing attachably and detachably a fine adjustment device adjusting minutely the azimuth angle and the angle of elevation to an antenna supporting device.

CONSTITUTION: A supporting base 20 to which an azimuth angle minute adjustment mechanism is fitted is fixed attachably and detachably to a supporting rod 10 of an antenna 1 by a retaining plate 21 and a bolt 22. A supporting base 30 to which an angle of elevation minute adjusting mechanism is fitted is fixed attachably and detachably to a supporting device via a connection hole by a bolt 31. The azimuth angle is adjusted minutely by delivering the movement of worm mechanisms 23A, 25A to a horizontal supporting member 5 via a connecting rod 28. On the other hand, the angle of elevation is adjusted minutely by delivering the movement of worm mechanisms 34A, 32B to an antenna supporting device 1B via an end part 6A of a supporting pin 6. Since each minute adjusting mechanism is removed after the end of minute adjustments, the supporting device of the antenna has no unnecessary mechanism and components thereby attaining simple and light structure.