A blind area is reduced by reducing an area between a subject and a receiver in which acoustic waves do not propagate. The present invention relates to a subject-information acquisition apparatus including a base a subject holding member on the base a receiver including a plurality of transducers and a support member on which the plurality of transducers are disposed and a fluid-level adjusting mechanism configured in such a manner that an acoustic matching material in a space enclosed by the base, the subject holding member, and the receiver can be at a fluid level higher than a boundary between the subject holding member and the base.
