It is possible to perform light emitting control to a subject taking into account measurement conditions (size and a pressing state of the subject).A subject information acquisition apparatus includes a pressure unit that presses the subject, a light emitting unit that emits light to the subject through the pressure unit, a distance information acquisition unit that acquires information related to a distance between the pressure unit and the light emitting unit, and a control unit that controls an operation of the light emitting unit on the basis of the information related to the distance acquired by the distance information acquisition unit.
