To grasp immediately a state at a control post at an emergency situation generation time and improve the visually recognition consciousness to a surrounding and visually recognition property, by constituting an emergency signal oscillation indicating light by an indicating light main body, a company name letter and emergency letter luminous indication LED unit, emergency signal oscillation circuit and antenna.

A company name letter 10 is indicated on the surface of the mail body case 1 of an emergency signal oscillation indicating light so as to always be recognized. An antenna 7 is installed on this case 1. The company name letter indication part 10 emits a light by cutting off LED luminous part roundly. An emergency letter SOS 5 is not indicated by letter in the main body case 1. An emergency signal oscillation part is installed inside the main body case 1 and the emergency signal is sent through the antenna 7. Further, when one switch is turned on, the emergency signal oscillation part and emergency letter SOS are always operated interlockingly at day and night. Even when the company name letter is turned on at night, the company name letter is turned off automatically and switched to the emergency signal oscillation part and emergency letter SOS indication.