A touch panel-including illuminator having: a light pipe made of a transparent
plate-like material having an upper surface, a lower surface and at least one incidence
side surface, the upper surface being provided with light output means through
which light incident on the incidence side surface is made to emerge from the lower
surface; a light source disposed on the incidence side surface of the light pipe;
an adhesive layer; and a touch panel bonded to the upper surface of the light pipe
through the adhesive layer; wherein the light output means are constituted by fine
grooves which are disposed discontinuously, each of which is made of a concave
portion, and each of which is shaped like an approximate triangle in section; and
wherein each of the fine grooves has an optical path changing slope and a steep slope.
