To make the flush light small in size, light in weight and capable of being portable at all times as a necessary instrument to be used, needless to say, as a flush light, and a whistle as well in case of emergency.

A cylindrical main body 1 is divided roughly at the center part, and is threadedly jointed together at its screw part 2 so as to be formed into a cylindrical body roughly 10mm in diameter, and roughly 40mm long. Out of an opening part 3 at one end, one lead wire taken out of the bottom part of a semiconductor light emitting body 4 capable of projecting light comes in contact with one pole plate within the main body 1, and the other lead wire is wired to the other pole plate through a switching part, a mouthpiece 8 is provided for the other end face, and an air chamber having a ventilating slit 9 is adjacently provided so as to be formed into the flush light.