In a medical imaging apparatus for imaging mammary gland and breast while compressing the breast with a compression plate, the posture of an ultrasonic probe relative to the compression plate is kept constant and the moving motion of the ultrasonic probe is stabilized. The apparatus includes: an imaging stage a compression plate an ultrasonic probe provided to maintain acoustic connection to the compression plate, for transmitting ultrasonic waves according to drive signals and receiving ultrasonic echoes to output reception signals an ultrasonic imaging unit for supplying the drive signals to the ultrasonic probe and generating image data based on the reception signals a detecting unit for detecting a location and/or a posture of the ultrasonic probe relative to the compression plate and a control unit for controlling the location and/or the posture of the ultrasonic probe based on a detection result of the detecting unit.
