A laser scanning device includes a light source (331), a rotary polytope (332), a motor (333), a bearing (333D), and a detection processing portiont (53). The rotary polytope (332) scans light emitted from the light source (331). The motor (333) rotates the rotary polytope (332). The bearing (333D) rotatably supports a rotation shaft (333A) of the motor (333). The detection processing portiont (53), in a case where the motor (333) is driven at a first speed that is higher than a predetermined reference speed, performs detection of an abnormal state based on an atmospheric temperature detected at a position located within a predetermined first range from the bearing (333D), and in a case where the motor (333) is driven at a second speed that is lower than the reference speed, does not perform the detection of the abnormal state, wherein the abnormal state is a state where the temperature of the bearing (333D) has exceeded a predetermined allowable temperature.
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