A rotation seat for a vehicle has a seat, a rotating plate and a base plate. The seat is fixed on the rotating plate which has a nail member and a biasing member. The biasing member forces the nail member. The rotating plate is rotatably connected to the base plate through a first shaft. The base plate has a guide slot so as to regulate extent of the rotation of the rotating plate by guiding the nail member. The guide slot has a first slot and a second slot. The biasing unit forces the second slot through the nail member so as to make the rotating plate rotate from an operator's exiting position to a forward driving position.
