<p>[Problem] To make combined use for display of 3D images and display of normal images possible in a 3D image display device for displaying a 3D image using two images consisting of a right eye image and a left eye image. [Solution] A monitor (9) provided with a right eye image display unit (40), a left eye image display unit (41), and a semi-transparent mirror (42), wherein a track (43a) provided in a base (43) is supported thereby in a manner such that the semi-transparent mirror (42) is capable of moving from a position centered between a display surface (40a) of the right eye image display unit (40) and a display surface (41a) of the left eye image display unit (41) to a position to the rear of the right eye image display unit (40) and the left eye image display unit (41).</p>
