PROBLEM TO BE SOLVED: To precisely evaluate the riding comfort of an occupant sitting in a vehicle. SOLUTION: The vibrating quantities of the floor, sheet sitting surface, and seat back of a vehicle are detected by a state detecting means 10, and a first physical quantity related to a direct vibration received by a human body part to which the vibration is directly transmitted and a second physical quantity related to the indirect vibration received by a human body part to which the vibration is not directly transmitted are calculated by a physical quantity arithmetic part 14. As the first physical quantity includes the compressing force and shearing force acting on the back and hip of an occupant, and the second physical quantity includes the twisting force and buckling force acting on the neck and buttocks of the occupant. The coefficients corresponding to the first and second physical quantities are multiplied by the first and second physical quantities in an evaluation coefficient part 16, whereby evaluation values are calculated, and the evaluation values are compared with prescribed evaluation standard values in an evaluation arithmetic part 18, whereby the riding comfort is evaluated. The indirect force which was not considered in the past is added as physical quantity of evaluation, whereby the riding comfort can be precisely evaluated.
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