A method for contactlessly detecting an indicated position on a reproduced image, comprising: using a light control means having a first and a second light control panel (13,14) placed face to face with each other with one side of each of the first and the second light control panel (13,14) in direct contact with each other, the first light control panel having band-like planar light-reflective portions arranged perpendicularly along their length on a surface on one side of a transparent flat plate at a constant pitch, the band-like planar light-reflective portions being arranged parallel to each other, the second light control panel having band-like planar light-reflective portions arranged perpendicularly along their length on a surface on one side of another transparent flat plate at a constant pitch, the band-like planar light-reflective portions being arranged parallel to each other, the band-like planar light-reflective portions of the first light control panel are forming a 90 degree angle with the band-like planar light-reflective portions of the second light control panel, displaying on a display provided on one side of the light control means an image of an operation panel having a plurality of switches, and forming a reproduced image R1 of the operation panel through the light control means in space on the other side of the light control means, characterized in that the method further comprises: 1) either arranging on a front side of the display in direct contact with the display a transparent sheet provided with an irregular reflection surface for infrared light that irregularly reflects infrared light or forming an irregular reflection surface for infrared light that irregularly reflects infrared light directly on the surface of the display; 2) irradiating the irregular reflection surface for infrared light with infrared light from an infrared light irradiating means provided at a position obliquely above the display and forming a reproduced image R2 of the irregular reflection surface for infrared light on the back side of the reproduced image R1; and 3) detecting an indicated position on the reproduced image R1 by receiving reflected infrared light from the reproduced image R2 through a two-dimensional infrared camera. using a light control means having a first and a second light control panel (13,14) placed face to face with each other with one side of each of the first and the second light control panel (13,14) in direct contact with each other, the first light control panel having band-like planar light-reflective portions arranged perpendicularly along their length on a surface on one side of a transparent flat plate at a constant pitch, the band-like planar light-reflective portions being arranged parallel to each other, the second light control panel having band-like planar light-reflective portions arranged perpendicularly along their length on a surface on one side of another transparent flat plate at a constant pitch, the band-like planar light-reflective portions being arranged parallel to each other, the band-like planar light-reflective portions of the first light control panel are forming a 90 degree angle with the band-like planar light-reflective portions of the second light control panel, displaying on a display provided on one side of the light control means an image of an operation panel having a plurality of switches, and forming a reproduced image R1 of the operation panel through the light control means in space on the other side of the light control means, characterized in that the method further comprises: 1) either arranging on a front side of the display in direct contact with the display a transparent sheet provided with an irregular reflection surface for infrared light that irregularly reflects infrared light or forming an irregular reflection surface for infrared light that irregularly reflects infrared light directly on the surface of the display; 2) irradiating the irregular reflection surface for infrared light with infrared light from an infrared light irradiating means provided at a position obliquely above the display and forming a reproduced image R2 of the irregular reflection surface for infrared light on the back side of the reproduced image R1; and 3) detecting an indicated position on the reproduced image R1 by receiving reflected infrared light from the reproduced image R2 through a two-dimensional infrared camera. 1) either arranging on a front side of the display in direct contact with the display a transparent sheet provided with an irregular reflection surface for infrared light that irregularly reflects infrared light or forming an irregular reflection surface for infrared light that irregularly reflects infrared light directly on the surface of the display; 2) irradiating the irregular reflection surface for infrared light with infrared light from an infrared light irradiating means provided at a position obliquely above the display and forming a reproduced image R2 of the irregular reflection surface for infrared light on the back side of the reproduced image R1; and 3) detecting an indicated position on the reproduced image R1 by receiving reflected infrared light from the reproduced image R2 through a two-dimensional infrared camera.