PROBLEM TO BE SOLVED: To provide a beam reflecting mechanism, a reflecting mirror driving mechanism and a reflecting mirror antenna having a simple relationship between a first mirror facing a reflecting mirror unit, a second mirror facing the first mirror, and a rotation axis for rotating the first mirror. Provide the device. SOLUTION: In a reflecting mirror driving mechanism, a tubular portion 10 has a first passage port on a side surface through which a receiving beam focused by a reflecting mirror portion or a transmitting beam reflected by a first mirror 1 and directed toward the reflecting mirror portion passes. Then, the first mirror 1 is arranged inside so as to face the first passage port, and the first housing portion that rotates together with the first mirror 1 with the optical axis between the first mirror 1 and the second mirror 2 as the rotation axis. 11 and a second housing portion 12 in which the second mirror 2 is arranged inside and has a second passage port on the side surface through which the reception beam reflected by the second mirror 2 or the transmission beam toward the second mirror 2 passes. It has a first rotation support portion 21 that connects the first housing portion 11 and the second housing portion 12 and rotatably supports the first housing portion 11. [Selection diagram] FIG. 10
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