SEAT RECLINING POSITION CONTROL DEVICE

A seat reclining position control device includes: a seat on which an occupant of a vehicle sits; an adjustment part configured to adjust an angle of a backrest of the seat; a sleep state detection unit configured to detect a sleep state of the occupant; a control unit that operates the adjustment unit to control the angle; and a vehicle interior detection unit configured to detect a vehicle interior state of the vehicle. The control unit implements a seat angle control to adjust the angle of the backrest for the occupant in the sleep state based on the vehicle interior state to a suitable sleeping angle suitable for sleeping when the sleep state detection unit detects the sleep state of the occupant.