Rotational device for a vehicle seat, and vehicle seat

The invention relates to a rotational device (10) for a vehicle seat, comprising a base element (20) and a seat part support (30) which can be rotated about a rotational axis (S) with respect to the base element (20). Said rotational device (10) can be moved from a base position into a rotated position by rotating the seat part support (30) with respect to the base element (20). A catch hook (37) is provided on the base element (20) and/or on the seat part support (30), said catch hook protruding in the radial direction over the base element (20) and/or over the seat part support (30).