A wind speed prediction device, comprising: a scattering signal acquiring unit to acquire a scattering signal that is each of a plurality of beams after being emitted to space and scattered in the space, the beams having mutually different elevation angles, which are angles formed by a line-of-sight direction and a horizontal direction; a Doppler frequency calculating unit to set a range bin width as distance resolution of each of scattering signals acquired by the scattering signal acquiring unit according to an elevation angle of each of the beams emitted to the space to enable monitoring of observation points of same range bins, the range bins being at the same altitude even for the plurality of beams at different elevation angles, and calculate a Doppler frequency of a range bin corresponding to a two-dimensional plane including an observation region from the each of the scattering signals; a first wind speed distribution estimating unit to estimate a wind speed distribution in the two-dimensional plane from the plurality of Doppler frequencies calculated by the Doppler frequency calculating unit; and a wind speed prediction unit (15, 16) to predict a wind speed in the observation region from the wind speed distribution in the two-dimensional plane estimated by the first wind speed distribution estimating unit; characterised in that; the first wind speed distribution estimating unit is configured to estimate the wind speed distribution in the two-dimensional plane using a volume velocity processing method; and the wind speed predication unit (15, 16) is configured to predict the wind speed in the observation region using a two-dimensional Navier-Stokes equation. a scattering signal acquiring unit to acquire a scattering signal that is each of a plurality of beams after being emitted to space and scattered in the space, the beams having mutually different elevation angles, which are angles formed by a line-of-sight direction and a horizontal direction; a Doppler frequency calculating unit to set a range bin width as distance resolution of each of scattering signals acquired by the scattering signal acquiring unit according to an elevation angle of each of the beams emitted to the space to enable monitoring of observation points of same range bins, the range bins being at the same altitude even for the plurality of beams at different elevation angles, and calculate a Doppler frequency of a range bin corresponding to a two-dimensional plane including an observation region from the each of the scattering signals; a first wind speed distribution estimating unit to estimate a wind speed distribution in the two-dimensional plane from the plurality of Doppler frequencies calculated by the Doppler frequency calculating unit; and a wind speed prediction unit (15, 16) to predict a wind speed in the observation region from the wind speed distribution in the two-dimensional plane estimated by the first wind speed distribution estimating unit; characterised in that; the first wind speed distribution estimating unit is configured to estimate the wind speed distribution in the two-dimensional plane using a volume velocity processing method; and the wind speed predication unit (15, 16) is configured to predict the wind speed in the observation region using a two-dimensional Navier-Stokes equation.