PURPOSE: To prevent the backlash of each slider in a device, in which a second slider, slidable along the first slider provided slidably a vehicle, is provided and connected to a display by means of a hinge, by improving the support structure of each slider.

CONSTITUTION: Retaining portions 12 are fixed right and left inside a cover 11, and a first slider is slidably provided on these retaining portions 12. And a second slider 14 is housed in a slider 13, and a display 17 having a liquid crystal display portion 16 is turnably provided on the operator seat side of the slider 14 through a hinge 15. First balls 31 are inserted into through-holes 12a formed on the side surfaces of the operator seat side of the retaining portions 12, which are butted against the slider 13 into contact and energized by means of a first push-pressing members 32. The second slider 14 is fixed attachably/detachably at the cover 11 by providing on the front side of the second slider 14 a heart cam 19 that is engaged stoppingly with an engage-stopping pin 18. Also, through-holes 14a are formed at the right and left of the front side of the second slider 14, and the second balls 33 are inserted into these holes, and likewise push-pressed against the inner side lower portions of the slider 13 by means of the force of the second push-pressing members 34.