A spatial light communication equipment being capable of providing compatibility between two communication equipments placed opposite to each other and of providing, with simplified configurations, highly accurate seizure and tracking capability and excellent beam directivity for ultra-long-distance communication. <??>Angular error in a receiving beam (36) is detected by an angle detector (33) disposed on an optical axis of light reflected by a first reflecting plane of a beam deflector (32) and, based on detected results, an angle deflected by the beam deflector (32) is corrected. The deflected angle of a transmitting beam is controlled by using a second reflecting plane which is a back-surface of the first reflecting plane of the beam deflector (32) and an error being equivalent to angular error occurring in the receiving beam is accurately corrected to obtain correct direction of emittance of the transmitting beam by using a signal transmitting optical antenna (31) having same magnification as signal receiving optical antenna (31) has and having polarity being opposite to the signal receiving optical antenna (31).(See Fig. 1) <IMAGE>
Communication equipment for free space optical signal