An acoustic wave apparatus is used, the apparatus comprising: a supporting member supporting an examinee and having insertion opening； a subject holding member holding the subject； a transducer array including transducers and being distant from the subject holding member； a load acquiring unit acquiring a load value applied between the supporting member and the subject holding member based on an amount of deformation of the subject holding member； a memory unit storing a first load reference value determined based on the amount of deformation of the subject holding member and an area applied with the load when the subject holding member and the transducer array come into contact with each other； a comparing and determining； and an interlock controlling unit.
