A top plate is provided for use in a cooking device having an induction heater alone or an infrared heater in addition, which comprises a transparent crystallized glass plate (1), a light-shading film (2) on a bottom surface of the glass plate and an ornamental film (3) formed on the top surface of the glass plate. The light-shading (2) film is a porous layer of inorganic pigment powder dispersed in glass matrix. The light-shading film (2) has small apertures at a portion corresponding to the infrared heater. Alternatively, it has a decreased thickness at the portion. In another alternative, a luster film is used in place of the inorganic pigment layer at the portion corresponding to the infrared heater.