Abstract: A swivel apparatus (16) on which a seat (10) is mounted in a vehicle to provide for rotation from a first position to a second position. The swivel apparatus (16) includes a support assembly (20) having a base member (22) with a plurality of legs (24, 24'. . . 24.sup.n) fixed to the vehicle. The base member (22) has a horizontal lower side (26) and a parallel horizontally upper side (28) with a central opening (30) that extends from the lower side (26) to the upper side (28). A collar (34) has a flange (36) which extends through the central opening (30) of the base member (22) to position a first bearing (37) between the collar (34) and the lower side (26) of the base member (22) while the flange (36) aligns a second bearing (38) on the upper side (28) of the base member (22). A mounting member (40) to which the seat (10) is connected is located a top of the second bearing (38) and attached to the flange (36) by a plurality of fastener (46, 46'. . . 46.sup.n) to define a unitary structure.