Vehicle seat passenger protection structure

A vehicle seat passenger protection structure, comprising:

• rail members that are fixed to a floor of a vehicle, that extend in a seat longitudinal direction, that are formed in an open cross-sectional shape opening toward a seat upper side as seen in a vertical sectional view, and that have lower surfaces at which a slit portion extends in the seat longitudinal direction;
• sliding members that are connected to a lower portion of a seat cushion, that are disposed at interiors of the rail members, and that are supported by the rail members so as to be slidable in the seat longitudinal direction;
• and
• upward movement suppression members that include main body portions, which are disposed so as to face lower surfaces of the rail members, and include fixing portions, which protrude toward the seat upper side from the main body portions, pass through the slit portions and are fixed to lower surfaces of the sliding members, the upward movement suppression members being movable in the seat longitudinal direction following the sliding members.