A laser radar device comprising: a light source to oscillate transmitted seed light; a speed measuring unit to measure a speed of a moving body in which the own device is mounted; a sawtooth wave generator to generate a sawtooth wave with a period corresponding to a difference between a preset frequency and a Doppler shift frequency corresponding to the speed measured by the speed measuring unit; a pulse signal generator to generate a pulse signal repeatedly ; a sawtooth wave cutting-out unit to output the sawtooth wave generated by the sawtooth generator only in a period during which the pulse signal generator generates the pulse signal; a phase modulator to shift a frequency of the transmitted seed light by performing phase modulation of the transmitted seed light in accordance with the sawtooth wave provided by the sawtooth wave cutting-out unit ; a pulse modulator to output pulsed light by performing pulse modulation of the transmitted seed light in accordance with the pulse signal generated by the pulse signal generator ; an optical antenna to emit the pulsed light which is the transmitted seed light whose frequency is shifted by the phase modulator , the transmitted seed light being pulse-modulated by the pulse modulator , into space, and thereafter to receive backscattered light of the pulsed light, which is backscattered by an observation target in the space; an optical heterodyne receiver to mix the backscattered light received by the optical antenna with the transmitted seed light oscillated by the light source , and to output a beat signal with a difference frequency between the backscattered light and the transmitted seed light; and a moving speed calculator to calculate a moving speed of the observation target from the beat signal output from the optical heterodyne receiver . a light source to oscillate transmitted seed light; a speed measuring unit to measure a speed of a moving body in which the own device is mounted; a sawtooth wave generator to generate a sawtooth wave with a period corresponding to a difference between a preset frequency and a Doppler shift frequency corresponding to the speed measured by the speed measuring unit; a pulse signal generator to generate a pulse signal repeatedly ; a sawtooth wave cutting-out unit to output the sawtooth wave generated by the sawtooth generator only in a period during which the pulse signal generator generates the pulse signal; a phase modulator to shift a frequency of the transmitted seed light by performing phase modulation of the transmitted seed light in accordance with the sawtooth wave provided by the sawtooth wave cutting-out unit ; a pulse modulator to output pulsed light by performing pulse modulation of the transmitted seed light in accordance with the pulse signal generated by the pulse signal generator ; an optical antenna to emit the pulsed light which is the transmitted seed light whose frequency is shifted by the phase modulator , the transmitted seed light being pulse-modulated by the pulse modulator , into space, and thereafter to receive backscattered light of the pulsed light, which is backscattered by an observation target in the space; an optical heterodyne receiver to mix the backscattered light received by the optical antenna with the transmitted seed light oscillated by the light source , and to output a beat signal with a difference frequency between the backscattered light and the transmitted seed light; and a moving speed calculator to calculate a moving speed of the observation target from the beat signal output from the optical heterodyne receiver . <EOS>