In this way, it is possible to change the orientation of the display unit 11 so that the display unit 11 will be oriented toward the middle point between the driver's seat 2 and the front passenger seat 3, namely the second position B in FIGS. 1 and 5, to let the occupant 3 a of the front passenger seat 3 watch the display, in the case of a still picture such as map information from the navigation