a touch panel having a panel body formed by transparent upper and lower electrodes spaced a predetermined distance . the touch panel is mounted on a front surface of a display device to detect a coordinate at a depressed position on the upper electrode . the improvement comprises a transparent insulating liquid material filled between the upper and lower electrodes and a coloring agent containing pigment or dyestuff dispersed in the liquid material . in another aspect , the improvement comprises a transparent insulating liquid material filled between the upper and lower electrodes and an insulating fine powder dispersed in the liquid material .