An ultrasonic diagnostic apparatus includes an ultrasonic observation unit (3) that forms an ultrasonic tomographic image based on an ultrasonic signal obtained by transmission/reception of the ultrasonic wave to/from inside of the living body, a position orientation calculation unit (4) that detects the position and/or the orientation of the ultrasonic tomographic image, a reference image memory (61) that stores the reference image data, a 3D guide image forming circuit (63) that forms a stereoscopic 3D guide image for guiding an anatomical position and/or orientation of the ultrasonic tomographic image based on the reference image data stored in the reference image memory (61) using the position and/or the orientation detected by the position orientation calculation unit (4), and a display unit (9) that displays the 3D guide image formed by the 3D guide image forming circuit (63).
