Abstract: A seat for rear passengers of an automotive vehicle comprising a seat portion and an upright back support portion, the seat portion being supported by a linkage mechanism on a seat frame which articulates to permit the seat portion to be moved forwardly toward the front of the vehicle without the necessity of tilting and inverting it, whereby the seat portion forms a cargo-carrying platform. The upright back support portion is foldable on the seat portion to form a continuation of the platform. When the seat portion is in a passenger-supporting position, it locks the upright back support portion to the frame. The lock is released as the seat portion articulates towards its cargo-carrying position. An over-center spring acts on the rearward margin of the seat portion and is stressed when the seat portion is moved into its locking position.