PROBLEM TO BE SOLVED: To reduce a deterioration of image quality due to a smoothing process and to reduce a difference in signal intensity between adjacent scanning lines due to simultaneous parallel reception. An ultrasonic diagnostic apparatus according to an embodiment includes an addition unit. The adder is based on the difference between the signal value of the first data related to the first ultrasonic image and the signal value of the second data related to the second ultrasonic image obtained by smoothing the first ultrasonic image. , The signal value of the first data and the signal value of the second data are weighted and added. [Selection diagram] Fig. 1【課題】平滑化処理による画質の低下を低減し、且つ並列同時受信に起因する、隣接する走査線間の信号強度差を低減すること。【解決手段】実施形態に係る超音波診断装置は、加算部を備える。加算部は、第１の超音波画像に関する第１のデータの信号値と、第１の超音波画像を平滑化した第２の超音波画像に関する第２のデータの信号値との差分に基づいて、第１のデータの信号値および第２データの信号値を重みづけ加算する。【選択図】 図１
