The present invention relates to a vehicle sheet with a seat back which is provided with a urethane pad covered with a trim cover, and a pressing unit on the reverse side of the urethane pad covered with the trim cover, the pressing unit being formed with a shaft extending laterally and a pair of pressure portions arranged in the vertical direction with respect to the shaft to support both the upper and lower sides of the urethane pad by detecting the intermediate position of turning movement of the pressing unit by means of a turning movement detection unit and stopping the turning movement of the pressing unit, or is configured to press forward the upper side of the urethane pad using the upper pressure portion or the lower side of the urethane pad using the lower pressure portion by turning the laterally-extending shaft of the pressing unit.