To provide a technology capable of displaying different display elements in an overlapped manner at an arbitrary timing, with respect to an illumination type key sheet in which the light received from an end face of a light guide sheet is emitted to the outside of an upper surface of the light guide sheet from a predetermined reflection region, for illumination.

A first reflection region 12, in which a plurality of micro reflection parts A are formed into the shape of first display element, is formed on the lower surface of a light guide sheet 13. A display layer which is to be a second display element is formed on the lower side of the light guide sheet 13 through a transparent resin layer having a lower refractive index than the light guide sheet 13 or an air layer v. The air layer v is provided on the lower side of the micro reflection parts. The shape of the micro reflection part A satisfies T≤W×2/3, where the height (T) from a lower surface 13b of the light guide sheet 13 is 1-10 μm, and the maximum width (W) is 5-70 μm.