The acoustic wave processing device includes a phasing addition unit which performs phasing addition on respective pieces of first element data with different elements as a reference to generate a plurality of pieces of first reception data, a reception data storage unit which stores first reception data, a reception data generation unit which superimposes two or more pieces of first reception data to generate second reception data, and a processing condition setting unit which sets the number of times of superimposition of first reception data. In a cine-reproduction mode, the reception data generation unit superimposes the set number of pieces of first reception data to generate second reception data.