Abstract: An underfloor double skin structure includes a first upper plate including a pair of first thin portions disposed on both end portions thereof and a first thick portion disposed inwardly with respect to the pair of first thin portions, a first lower plate disposed to be spaced apart downward of the first upper plate and including a pair of second thin portions disposed on both end portions thereof and a second thick portion disposed inwardly with respect to the pair of second thin portions, a first rib group integrally formed with the first upper plate and the first lower plate and connects the first upper plate and the first lower plate, a reinforcing body is formed of the first thick portion, the second thick portion, and a pair of thick ribs, and the second thick portion is disposed downward of the pair of second thin portions.

Abstract: A backrest includes a panel-shaped base member that is provided along a main surface which includes a reference line extending in a direction intersecting a floor surface of a vehicle, and a retaining member that is provided on a front surface of the base member and that has a front surface which has a curved surface shape in a state in which the retaining member is supporting a load in a direction toward the main surface. Due to this configuration, the retaining member presents a curved surface shape due to the load of a standing passenger when the passenger leans against the backrest, and thereby the passenger's body can be stably retained.

Abstract: Disclosed is a vehicle sliding door device including a sliding door rail formed along a movement direction, and a sliding door including an engagement unit engaged with the sliding door rail, and which is opened and closed when the engagement unit is moved along the sliding door rail. The sliding door rail includes a rattling prevention unit in the region of an end section corresponding to the closed position of the sliding door, in which a gap between the engagement unit of the sliding door and the sliding door rail is narrower than a gap between the engagement unit of the sliding door and the sliding door rail in other regions.

Abstract: A sealing member is disposed between a lateral surface of a vehicle body and a lateral sliding door supported by the vehicle body in such a way as to be capable of being slid along the lateral surface, between a closed position in which an opening of an entrance formed in the lateral surface is closed and an open position in which the opening is open. The sealing member includes a pressing plate attached to the lateral surface; an attachment portion clamped and fixed between the pressing plate and the lateral surface to which the pressing plate is attached, and having a hollow cylindrical shape extending in a vertical direction of the lateral sliding door; and a sealing portion provided integrally with the attachment portion, and contacting with door trailing edge rubber provided on the lateral sliding door while being in an elastically deformed state at the closed position.