An ultrasonic imaging apparatus includes a plurality of transducers aligned in a line, a select circuit configured to cause transducers selected from the plurality of transducers to transmit an ultrasonic pulse and receive a plurality of received signals, respectively, and a digital signal processing circuit configured to align in time and add up the plurality of received signals weighted by a plurality of respective weighting factors, wherein the digital signal processing circuit changes the plurality of weighting factors according to a time position on the plurality of received signals such that ratios between the plurality of weighting factors change.