PURPOSE: An optical waveguide member is provided to slim the thickness of a device. CONSTITUTION: An incident unit(20) is formed on one side of a body so that light provide from a light source is incident. A side pattern unit(30) is formed on a side of a body to emit or reflect light incident into a body. A plate surface pattern unit(40) is formed a plane surface of a body or a lower plate surface to emit or reflect light incident into the body.
