Provided is an ultrasonic imaging device capable of compensating for degradation of image quality due to inhomogeneity of a medium under test. A reception beam former (108) synthesizes a signal received by an ultrasonic element array (105) after performing phasing processing of the signal in each of two or more steering directions. The two or more steering directions are designated by a steering direction designation unit (112). The two or more steering directions include two directions forming a predetermined angle on each of the right and left along the arrangement direction of the ultrasonic element array, with respect to the direction of reception focusing. The predetermined angle is preferably a null angle.
