A signaling lamp including a hollow cylindrical supporting column made from a light-transmitting material which has a central portion bulged outwardly so that the interior surfaces are made into reflective surfaces. LEDs are arranged in rows so as to face each other above and below the reflective surfaces, and the supporting column and the LEDs are surrounded by a globe which has diffusing lenses. The light from the LEDs is reflected toward the circumference by the reflective surfaces and is projected into the surrounding area via the globe.