There is realized an ultrasonic diagnostic apparatus that eliminates the restriction on the image generation in ultrasonic diagnostic apparatuses imposed by generation of no more than one delay curve, and enables imaging with higher resolution and higher speed.A received signal processor 12 comprises delayers 13, 14-1, and 14-2 disposed for every reception channel, and a synthesiser 60. The first delayer 13 delays received signals produced from a transmission beam 31 by a first delay time for phasing the received signals for a predetermined reception focus. The second delayer 14-1 delays received signals produced from a sound wave of a predetermined phase different from the phase of the transmission beam 31 by a second delay time for phasing the received signals for the same reception focus. The synthesiser 60 adds first phased signals generated by the first delayer, and second phased signals generated by the second delayer 14-1.
