An automotive seat with a seat cushion tilt device, wherein a seat cushion may be tilted forwardly or downwardly by the seat cushion tilt device in relation to a slide rail disposed under the seat cushion, and wherein a shield cover is secured on the slide rail to cover a spacing defined at the backward section of the seat cushion. The shield cover is provided with an auxiliary cover member which serves to cover a clearance which is to be created between the shield cover and the foregoing spacing when the seat cushion is tilted forwardly or backwardly by operation of the seat cushion tilt device, whereby a part of the slide rail and seat cushion tilt device are prevented against exposure through such spacing.