A laser radar device comprising: a modulator for causing a transmission seed light beam to branch, introducing differing offset frequencies to a plurality of branched transmission seed light beams, modulating each of the plurality of transmission seed light beams into a pulsed light beam, and outputting a plurality of pulsed light beams, or for modulating a transmission seed light beam into a pulsed light beam, causing the pulsed light beam to branch, introducing differing offset frequencies to a plurality of branched pulsed light beams, and outputting the plurality of pulsed light beams; an optical amplifier for amplifying the plurality of pulsed light beams output from the modulator; an optical antenna for emitting the plurality of pulsed light beams amplified by the optical amplifier into space, and receiving backscattered light beams of the plurality of emitted pulsed light beams; a receiver for detecting respective beat signals from the plurality of backscattered light beams received by the optical antenna; a filter in which frequency bands each including a frequency of signal components included in the plurality of beat signals detected by the receiver are set as pass bands and frequency bands not including any of the frequencies of the signal components are set as cutoff bands; and a converter for sampling the beat signals passing through the filter at a sampling frequency, wherein the modulator introduces the offset frequencies such that a frequency interval of the plurality of pulsed light beams output to the optical amplifier is larger than a gain bandwidth of stimulated Brillouin scattering to be generated in the optical amplifier or a transmission path from the optical amplifier to the optical antenna . a modulator for causing a transmission seed light beam to branch, introducing differing offset frequencies to a plurality of branched transmission seed light beams, modulating each of the plurality of transmission seed light beams into a pulsed light beam, and outputting a plurality of pulsed light beams, or for modulating a transmission seed light beam into a pulsed light beam, causing the pulsed light beam to branch, introducing differing offset frequencies to a plurality of branched pulsed light beams, and outputting the plurality of pulsed light beams; an optical amplifier for amplifying the plurality of pulsed light beams output from the modulator; an optical antenna for emitting the plurality of pulsed light beams amplified by the optical amplifier into space, and receiving backscattered light beams of the plurality of emitted pulsed light beams; a receiver for detecting respective beat signals from the plurality of backscattered light beams received by the optical antenna; a filter in which frequency bands each including a frequency of signal components included in the plurality of beat signals detected by the receiver are set as pass bands and frequency bands not including any of the frequencies of the signal components are set as cutoff bands; and a converter for sampling the beat signals passing through the filter at a sampling frequency, wherein the modulator introduces the offset frequencies such that a frequency interval of the plurality of pulsed light beams output to the optical amplifier is larger than a gain bandwidth of stimulated Brillouin scattering to be generated in the optical amplifier or a transmission path from the optical amplifier to the optical antenna . <EOS>