The invention discloses a seat for vehicle. The seat comprises a seat back with a front face and a back face, and is characterized by further comprising a supporting table plate and a locking device, the lower end of the supporting table plate is connected to the back face of the seat back in a rotatable mode, and the upper end of the supporting table plate is locked to be closely attached to the back face of the seat back through the locking device. By means of the seat for vehicle, when a passenger needs to be supported to sleep on a table, the supporting table plate is rotated to be unfolded, and when not needing to be used, the supporting table plate is rotated till the upper end of the supporting table plate is closely attached to the back face of the seat back.