Vehicle seat

A vehicle seat, comprising a seat cushion provided on a floor of a vehicle and a seat back provided on the seat cushion, wherein:

• the seat cushion is provided so as to be rotatable relative to the floor about a selected one of multiple rotation axes extending substantially vertically,
• a rotation device is provided between the floor and the seat cushion, the rotation device being configured to enable rotation about the selected one of the multiple rotation axes while restricting rotation about any of the remaining rotation axes,
• the rotation device comprises multiple rotation shaft units, and
• each of the multiple rotation shaft units comprises:
• a lower rail extending in a first horizontal direction;
• an upper rail extending in a second horizontal direction different from the first horizontal direction;
• a lower slider provided on the lower rail to be slidably movable thereon;
• an upper slider provided on the upper rail to be slidably movable thereon and coupled with the lower slider to be rotatable about an axis extending substantially vertically;
• and
• restriction members configured to selectively restrict movement of the lower slider relative to the lower rail and movement of the upper slider relative to the upper rail.