A lidar apparatus 100 includes: a precipitation determiner 29 determining whether precipitation exists on an external surface of a light transmission window 51, from at least one of a measurement success or failure result 34 representing whether a wind velocity vector is measured and a signal-to-noise ratio 35 as well as from a wiper operation 32 in a first period; a foreign matter detector 30 detecting foreign matter hindering laser light and reflected light from passing through the light transmission window 51, based on at least one of the measurement success or failure result 34 and the signal-to-noise ratio 35; and a wiper operation controller 30 controlling a wiper 52 and a washer fluid supplier 61. When the precipitation determiner 29 determines that precipitation exists, the wiper operation controller 30 causes the wiper 52 to operate and the washer fluid supplier 61 not to operate. When the precipitation determiner 29 does not determine that precipitation exists while the foreign matter detector 30 detects that foreign matter exists, the wiper operation controller causes the washer fluid supplier 61 and the wiper 52 to operate.
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