Seat lift mechanism in automotive vehicle

A seat lift mechanism for an automotive vehicle composed of a seat support mechanism (A) capable of placing a passenger seat (S) mounted thereon in a sideways position where a front of the passenger seat is oriented toward a side door opening (192) of the vehicle, a slide mechanism (B) capable of displacing the passenger seat placed in the sideways position to and from a forward position, and a lift mechanism (C) capable of lowering the passenger seat from the forward position to a lower position adjacent a ground surface through the side door opening and of lifting the passenger seat up to the forward position from the lower position. In the seat lift mechanism, the seat support mechanism (A), slide mechanism (B) and lift mechanism (C) are arranged between the seat cushion (Sa) of passenger seat (S) placed in the sideways position and a compartment floor of the vehicle to provide a sufficient space behind the back rest (Sb) of passenger seat (S).