Patent attributes
An occupant protection device includes: a lumbar support section that is displaceable between an upper limit position and a lower limit position, and is displaceable between an advanced position pressing against the lumbar region and a retreated position further to a seatback rear side than the advanced position; a displacement mechanism that displaces a frontmost location of the lumbar support section; a rear collision prediction section that predicts a rear-end collision to a vehicle; and an actuation controller that, in cases in which a vehicle rear-end collision has been predicted by the rear collision prediction section in a state in which the frontmost location of the lumbar support section is not at the lower limit position, controls the displacement mechanism, and sets the frontmost location at the lower limit position and at the advanced position.