A gaze-vibration detection unit that detects vibrations of the occupant's gaze for the purpose of obtaining a motion sickness estimation device that can correctly estimate motion sickness and does not need to force the occupant to gaze at the terminal, and the gaze An object vibration detection unit that detects vibration of an object ahead of the vehicle, a vibration comparison unit that calculates a vibration difference from the vibration of the line of sight and the vibration of the object, and the occupant is in motion sickness based on the vibration difference A motion sickness determination unit that determines whether the motion sickness is detected by measuring the acceleration of the object, and the motion sickness determination unit detects a time of the vibration difference. An integral value is used for the determination.
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