Disclosed is an ultrasonic diagnosis device which is provided with a shutter mechanism. The shutter mechanism conceals an opening portion (a passage for a rotation shaft member), which is uncovered behind an operation panel when the operation panel moves forward, so as to enhance the appearance and safety. The shutter mechanism has a pair of first shutter plates and a pair of second shutter plates, the pairs overlapping each other. Each shutter plate rotates about a predetermined rotational shaft which does not slide back and forth. Each shutter plate has a pin slot into which a slide pin is inserted. A pair of slide pins are provided on a member that slides back and forth. When the pair of slide pins move forward, the contact relationship between the pair of slide pins and a plurality of pin slots causes the pair of first shutter plates to start closing first, and subsequently the pair of second shutter plates start closing.