Entry/exit support structure of vehicle seat

An entry/exit support structure of a vehicle seat, comprising:

• a side support cushion portion of a seat cushion, the side support cushion portion being provided at at least one side in a seat transverse direction of the seat cushion on which a vehicle occupant sits such that in a lowered position, an upper surface of the side support cushion portion forms a continuation of the seat cushion and is generally in the same plane as an upper surface of the seat cushion, and the side support cushion portion is configured to be displaced in a seat vertical direction such that the upper surface of the side support cushion portion rises out of the plane;
• a seat sliding mechanism that supports the seat cushion to be configured to slide in a seat front-rear direction, and that has a locking device that restricts sliding of the seat cushion in the seat front-rear direction;
• and
• a side support cushion portion restricting mechanism that has a release operation portion comprising a support lock releasing lever operated by a vehicle occupant, the support lock releasing lever being connected to the locking device,
• wherein moving the support lock releasing lever into a state in which the release operation portion is positioned at a lock position restricts displacement of the side support cushion portion in the seat vertical direction, and, moving the support lock releasing lever into a state in which the release operation portion is positioned at a release position causes both the restricting mechanism and the locking device to be released such that both displacement of the side support cushion portion in the seat vertical direction and sliding of the seat cushion in the seat front-rear direction are permitted.