Seat unit, vehicle, and conveyance seat

A seat unit comprising:

• an occupant support portion supporting an occupant;
• a plurality of movable mechanisms respectively moving a plurality of parts constituting the occupant support portion;
• and
• a control unit controlling respective operations of the plurality of movable mechanisms, wherein
• the control unit causes each of the plurality of movable mechanisms to undergo a transition from a current state to a target state,
• the plurality of movable mechanisms have a first movable mechanism requiring a longest time for the transition,
• the control unit causes timings of the completion of the respective current-to-target state transitions of the plurality of movable mechanisms including the first movable mechanism to be substantially the same, and the control unit determines a transition initiation timing of each of the plurality of movable mechanisms based on a time required for the current-to-target state transition of each of the plurality of movable mechanisms such that the control unit set the transition initiation timing of the movable mechanism other than the first movable mechanism after the transition initiation timing of the first movable mechanism, and therefore the control unit causes the transitions of the plurality of movable mechanisms other than the first movable mechanism to be completed by completion of the transition of the first movable mechanism from the current state to the target state.