ON-VEHICLE ACOUSTIC IMAGING DEVICE

PROBLEM TO BE SOLVED: To prevent a display device provided in front of a device main body in such a way as to be freely opened/closed, from rattling and thereby making a noise. SOLUTION: The acoustic imaging device is equipped with a front surface plate 2 mounted in front of a device main body 1, a display device 4 supported in front of the front surface plate 2 in such a way as to be freely opened/ closed, a locking mechanism including both a locking piece 7 holding the display device 4 in a closed condition and a locking groove 8, and with an elastic plate 18 which is fitted in an image adjusting fixture inserting hole formed in the back face of the display device 4, and is brought into contact with the front surface plate 2 when the display device 4 is in a closed condition, and the display device 4 is prevented from rattling by the elastic plate 18. Besides, even when the display device 4 is closed in a state that a part of a cassette is protruded out of a cassette insertion hole provided in front of the front surface plate 2, since the elastic plate 18 is hit against the end face of the cassette, so that the cassette can thereby be prevented from being damaged.