A holding member is provided which is capable of, in an acoustic wave apparatus. The holding member includes: a sheet portion configured to separate an upper space for a subject and a lower space for a lower acoustic matching liquid and to store an upper acoustic matching liquid thereon and a frame portion configured to tauten the sheet portion in a semi-container shape, and a transmission loss by the sheet portion with respect to an acoustic wave is smaller than a transmission loss by the frame portion with respect to the acoustic wave.
