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.
