A portable ultrasonic diagnostic device having a tilt function and turning function for a display panel, wherein a display housing provided with the display panel is supported on a main housing by a biaxial hinge mechanism in order to prevent damage or the like to each of the parts of the device. The biaxial hinge mechanism includes a tilt function for tilting the display housing about a horizontal tilt rotational shaft, and a turning function for turning the display housing about a vertical turning shaft. Provided to the tilt rotational shaft is a mechanism for restricting tilt rotation in the direction for closing the display housing in places other than a predetermined position in the direction of rotation of the turning shaft of the display housing, and releasing the restriction of the tilt rotation only at the predetermined position.
