The information on the constellations is given on a table (5) of constellations. The table (5) of constellations is illuminated by the light emitted from a light source, which consists of a bulb (7), and passed through a semi-transparent plate which is capable of diffusion-permeating the light from the light source therethrough. The table (5) of constellations is viewed through a magnifying lens (2). According to this invention, a bulb is used as the light source, and the information on the constellations is magnified by a lens. Therefore, a light, handy, miniaturized star chart device can be obtained.