An apparatus includes a bed configured to support a subject and having an insertion hole through which a subject portion that is part of the subject is inserted a pair of compression plates configured to hold and compress the subject portion when the subject portion is inserted through the insertion hole and a unit including therein the pair of compression plates and having an opening through which an operator inserts a hand when the subject portion is inserted through the insertion hole. The unit includes a receiving plate at a position opposite to the opening in an insertion direction of the hand within a range of the insertion hole when viewed from the insertion hole.
