An object is inserted through a first opening of a bed, and a probe is disposed which includes a breast support member supporting a plurality of first acoustic wave detection elements, which receive an acoustic wave propagated from the object and output a first reception signal so that the first acoustic wave detection elements are oriented to a predetermined area. The probe is separated from the object inserted through the first opening of the bed in the normal direction of the opening surface of the first opening. The bed holds a plurality of second acoustic wave detection elements that receive the acoustic wave propagated from the object and output the second reception signal, and orient the second acoustic wave detection elements to the predetermined area.
