A laser radar device for transmitting laser light ahead of a wind turbine and receiving scattered light of the laser light scattered at a transmission destination, the laser radar device being installed in a spinner portion of the wind turbine, the laser radar device comprising: a jig holding the laser radar device inside the spinner portion and fixed to a nacelle portion of the wind turbine in such a manner that the laser radar device does not rotate together with the spinner portion; a beam scanner for performing scanning with a laser beam of the laser light not depending on rotation of the wind turbine; a trajectory section determining unit for determining a divided section in which the laser beam is present among a plurality of divided sections obtained by dividing a trajectory drawn in front of the wind turbine by the laser beam with which the beam scanner has performed scanning; an analyzing and integrating unit for, per each divided section in which the trajectory section determining unit has determined that the laser beam is present, analyzing reception signals of the scattered light to calculate reception spectra for each distance in a line-of-sight direction of the laser beam, and integrating the calculated reception spectra; a storing and integrating unit for storing a reception spectrum calculated for each divided section by the analyzing and integrating unit; a wind speed calculating unit for calculating a wind speed for each divided section using the reception spectrum for each divided section input from the storing and integrating unit, wherein the trajectory drawn by the laser beam in front of the wind turbine is divided by the number of divisions for each distance in a line-of-sight direction of the laser beam, and the number of divisions of the trajectory is made smaller in a case where the distance in the line-of-sight direction of the laser beam is short than in a case where the distance is long. a jig holding the laser radar device inside the spinner portion and fixed to a nacelle portion of the wind turbine in such a manner that the laser radar device does not rotate together with the spinner portion; a beam scanner for performing scanning with a laser beam of the laser light not depending on rotation of the wind turbine; a trajectory section determining unit for determining a divided section in which the laser beam is present among a plurality of divided sections obtained by dividing a trajectory drawn in front of the wind turbine by the laser beam with which the beam scanner has performed scanning; an analyzing and integrating unit for, per each divided section in which the trajectory section determining unit has determined that the laser beam is present, analyzing reception signals of the scattered light to calculate reception spectra for each distance in a line-of-sight direction of the laser beam, and integrating the calculated reception spectra; a storing and integrating unit for storing a reception spectrum calculated for each divided section by the analyzing and integrating unit; a wind speed calculating unit for calculating a wind speed for each divided section using the reception spectrum for each divided section input from the storing and integrating unit, wherein the trajectory drawn by the laser beam in front of the wind turbine is divided by the number of divisions for each distance in a line-of-sight direction of the laser beam, and the number of divisions of the trajectory is made smaller in a case where the distance in the line-of-sight direction of the laser beam is short than in a case where the distance is long. <EOS>