An ultrasonic diagnostic apparatus realizes reception focusing processing of performing high-accuracy phase-matching and addition on complex baseband signals by using more continuous amounts of delay than those in conventional reception focusing processing. The apparatus includes: a signal processing unit for generating a complex baseband signal based on a reception signal outputted from each of ultrasonic transducers; a first computing unit for obtaining an amplitude value and a phase value of the complex baseband signal; a phase correcting unit for correcting the phase value; a second computing unit for obtaining a real number component or an imaginary number component of the complex baseband signal based on the amplitude value and the corrected phase value; and an adding unit for adding real number components or imaginary number components of complex baseband signals obtained with respect to the ultrasonic transducers to generate a phase-matched and added signal.