An acoustic imaging apparatus includes an image forming unit including a transducer array that includes a downwardly recessed portion on which a plurality of transducers, which include reception surfaces that receive acoustic waves generated by a subject, are arranged. The image forming unit forms an image based on outputs from the transducers. Impedance matching liquid is disposed on the inner side of the transducer array. A cover member is connected to the vessel and covers the transducer array at a side opposite to a side at which the reception surfaces are arranged so that a vessel and the cover member form a housing space that accommodates the transducers. The transducers are provided with signal lines through which electric signals based on the received acoustic waves are output and which extend from the housing space to the outside through a waterproof member.
