A laser radar device comprising: a light source for generating light with a single wavelength; a modulator for modulating the light generated by the light source into transmission light; a beam scanner (7, 13) for carrying out beam scanning by which the transmission light modulated by the modulator is radiated, and the light reflected is received as received light; a beam scanning controller for controlling a radiation direction of the beam scanner (7, 13); a signal processing unit for carrying out wind measurement by performing heterodyne detection by using the light generated by the light source and the corresponding received light received by the beam scanner (7, 13); and an optical axis corrector for successively correcting an optical axis angular shift occurring between the transmission light and the received light which vary with time owing to the beam scanning, with respect to the received light used by the signal processing unit or the transmission light used by the beam scanner (7, 13), on a basis of information indicating the radiation direction of the transmission light in the beam scanner (7, 13), the information being successively received from the beam scanning controller, and on a basis of an angular speed of the beam scanning and a wind measurement distance, wherein the optical axis corrector comprises: two wedge prisms (1325a, 1325b) with their flat faces being disposed perpendicularly to a reference optical axis; and a rotation controller for correcting the optical axis angular shift by carrying out simultaneous rotation control of the two wedge prisms (1325a, 1325b) in a manner as to follow change of the information indicating the radiation direction of the transmission light from the beam scanner (7, 13), the information being successively received from the beam scanning controller, in a state in which the two wedge prisms (1325a, 1325b) are provided with a relative angular difference and the angular difference is being maintained, on the basis of the angular speed of the beam scanning and a specified wind measurement distance used for correcting the optical axis angular shift. a light source for generating light with a single wavelength; a modulator for modulating the light generated by the light source into transmission light; a beam scanner (7, 13) for carrying out beam scanning by which the transmission light modulated by the modulator is radiated, and the light reflected is received as received light; a beam scanning controller for controlling a radiation direction of the beam scanner (7, 13); a signal processing unit for carrying out wind measurement by performing heterodyne detection by using the light generated by the light source and the corresponding received light received by the beam scanner (7, 13); and an optical axis corrector for successively correcting an optical axis angular shift occurring between the transmission light and the received light which vary with time owing to the beam scanning, with respect to the received light used by the signal processing unit or the transmission light used by the beam scanner (7, 13), on a basis of information indicating the radiation direction of the transmission light in the beam scanner (7, 13), the information being successively received from the beam scanning controller, and on a basis of an angular speed of the beam scanning and a wind measurement distance, wherein the optical axis corrector comprises: two wedge prisms (1325a, 1325b) with their flat faces being disposed perpendicularly to a reference optical axis; and a rotation controller for correcting the optical axis angular shift by carrying out simultaneous rotation control of the two wedge prisms (1325a, 1325b) in a manner as to follow change of the information indicating the radiation direction of the transmission light from the beam scanner (7, 13), the information being successively received from the beam scanning controller, in a state in which the two wedge prisms (1325a, 1325b) are provided with a relative angular difference and the angular difference is being maintained, on the basis of the angular speed of the beam scanning and a specified wind measurement distance used for correcting the optical axis angular shift. two wedge prisms (1325a, 1325b) with their flat faces being disposed perpendicularly to a reference optical axis; and a rotation controller for correcting the optical axis angular shift by carrying out simultaneous rotation control of the two wedge prisms (1325a, 1325b) in a manner as to follow change of the information indicating the radiation direction of the transmission light from the beam scanner (7, 13), the information being successively received from the beam scanning controller, in a state in which the two wedge prisms (1325a, 1325b) are provided with a relative angular difference and the angular difference is being maintained, on the basis of the angular speed of the beam scanning and a specified wind measurement distance used for correcting the optical axis angular shift.