A motion sickness estimation device (100) is provided with: a sensory conflict amount calculation unit (10) that estimates, on the basis of head motion of an occupant caused by rocking motion of a vehicle, a conflict amount between a plurality of types of sensory amounts perceived by the occupant for the head motion of the occupant; a driving situation characteristic extraction unit (30) that extracts, on the basis of at least one of the head motion of the occupant and the motion of the vehicle, a characteristic of a driving situation related to motion sickness from the driving situation; a habituation progress state determination unit (20) that determines, on the basis of biometric information of the occupant, whether habituation of the occupant to the driving situation is progressing; a sensitivity setting unit (40) that sets a sensitivity to the characteristic of the driving situation on the basis of the habituation progress state; a sensory conflict amount correction unit (50) that corrects the sensory conflict amount on the basis of the sensitivity; and a motion sickness estimation unit (60) that estimates the motion sickness state of the occupant on the basis of the sensory conflict amount after the correction.
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