To view an input screen while viewing an attitude of operation reflected in a reversal mirror even when touch-type input is impossible in time of keyboard touch of a personal computer, and to avoid bending a neck or dropping a head to reduce a stiff neck, headache or the like.

In this device, the reversal mirror wherein an angle, a height or a direction can be adjusted can be installed to an upper part of a personal computer monitor. Thereby, because shifting only a view line to the reversal mirror or a monitor screen as viewing the front, personal computer operation becomes possible with the attitude always improved. Because the key touch can be performed with a blind touch feeling, it leads to instantaneous finding of erroneous key touch and reduction of the stiff neck, the headache or fatigue, and practice of blind touch can be performed.