Abstract: There is disclosed a tongue depressor which has a light function to visually examine or clean the inside of a mouth easily and effectively, and which can be operated even by one hand, and light deep teeth or a throat part without any reductions in the amount of a light. Because of a structure in which a hole is bored in the main body of the tongue depressor, and a lighting fixture such as a commercially available penlight can be inserted/pulled out, two functions, i.e., a tongue depressor and lighting, can be provided. A shape is simple, fabrication costs are low, and sanitary supervision is easy. Since the tongue depressor can be operated by one hand, mouth cleaning can be carried out by the other hand.