An ultrasonic imaging apparatus includes an image obtaining unit for irradiating an imaging region and obtaining tomographic image information that draws the imaging region, an input unit for inputting scan parameter value information and a target sound pressure parameter value as an index of an estimated sound pressure in the subject, an estimated maximum sound pressure parameter value calculating device for calculating an estimated maximum sound pressure parameter value in the subject on the basis of the scan parameter value information and maximum drive voltage information of a piezoelectric transducer group for generating an ultrasonic wave, and a maximum drive voltage optimization device for comparing the estimated maximum sound pressure parameter value and the target sound pressure parameter value and optimizing the maximum drive voltage value of the maximum drive voltage information.