According to one embodiment, a head restraint attached to a top of a bed of one of a medical image diagnosis apparatus and a medical treatment apparatus, the head restraint comprises a headrest portion configured to allow a head of an object to be placed thereon, with the object being placed on the top, and an arm up holder configured to be detachable from the headrest portion and place an arm of the object near one of a vertex of the head of the object and a temple of the head when the head of the object is placed on the headrest portion.