An ultrasonograph of the present invention comprises a probe (1), a controller (3) connected to the probe (1), and a display (4) connected to the controller (3). The controller (4) causes the display (4) to display a detected image of a target object detected by the probe (1) and an angular position relationship image showing a relative angular position of the probe to the detected image of the target object. This enables even a non-expert to take accurate measurements.
