Abstract: A slide rail is configured to have a specified front-upward slant angle within a range of 9-11 degrees relative to a floor panel such that a seat slides longitudinally with the specified front-upward slant angle and adjustably over a specified longitudinal range along the slide rail, a thigh support portion is provided at a front end portion of a seat cushion so as to swing vertically around its rear portion with an adjustable swing-angle range of 4 degrees or greater, and a seat device of a vehicle does not comprise any other lift mechanism for adjusting a height of the seat than the slide rail having the specified front-upward slant angle.

Abstract: A pressing face of an acceleration pedal, which is formed to slant such that a front portion thereof is positioned at a higher level than a rear portion thereof, is located in front of a pressing face of a brake pedal, which is formed to slant such that a front portion thereof is positioned at a higher level than a rear portion thereof. A slant angle of the pressing face of the acceleration pedal relative to a horizontal face is different from a slant angle of the pressing face of the brake pedal relative to the horizontal face in a side view. Accordingly, a lower structure of a driver's compartment which can improve the operation of the acceleration and brake pedals can be provided.

Abstract: A slide rail is configured to have a specified front-upward slant angle within a range of 9-11 degrees relative to a floor panel such that a seat slides longitudinally with the specified front-upward slant angle and adjustably over a specified longitudinal range along the slide rail, a thigh support portion is provided at a front end portion of a seat cushion so as to swing vertically around its rear portion with an adjustable swing-angle range of 4 degrees or greater, and a seat device of a vehicle does not comprise any other lift mechanism for adjusting a height of the seat than the slide rail having the specified front-upward slant angle.

Abstract: A pressing face of an acceleration pedal, which is formed to slant such that a front portion thereof is positioned at a higher level than a rear portion thereof, is located in front of a pressing face of a brake pedal, which is formed to slant such that a front portion thereof is positioned at a higher level than a rear portion thereof. A slant angle of the pressing face of the acceleration pedal relative to a horizontal face is different from a slant angle of the pressing face of the brake pedal relative to the horizontal face in a side view. Accordingly, a lower structure of a driver's compartment which can improve the operation of the acceleration and brake pedals can be provided.

Abstract: In a vehicle in which a driver's seat is provided on a floor panel and an operational pedal, such as a brake pedal, is provided in front of the driver's seat, a slant floor portion is provided in an area of the floor panel where a heel of a driver pressing the operational pedal is placed. This slant floor portion slants with a specified slant degree in such a manner that its front portion is positioned at a higher level than its rear portion. An interference avoidance portion which is comprised of a horizontal face portion is provided in front of the slant floor portion. This interference avoidance portion has a slant degree which is smaller than the specified slant degree of the slant floor portion so as to avoid interference with the heel of the driver's foot.