To allow generation of many light signals, rotation that does not rely on a mechanical component, and generation of appearance of an oscillation light signal, by generating the light signals with a selective illumination on a plurality of light emitting diode source arranged on a front surface of a light emitter support portion in an alarm signal generating device, and carrying a current in a controller for changing strength of a supplied power.

A light emission diode is used as light sources 30 that are formed as an array on a light emitter support portion 12 having flexibility and is conducted with a controller and a power source or a battery, and reduction of heat generation, current leading, and electromagnetic wave release, and extension of lamp's service life are realized. Luminescence of a plural different colors from the light sources 30 is useful for a color light signal for an emergency vehicle. A controller having a microprocessor and a circuit selectively activates each light source 30 and provides an illusion of a signal of constant light, strobe light, pulse-shaped light, and flushing light or a light signal rotating or oscillating. The illusion of rotation of an alarm signal-generating device 10 is caused by modulation of power strength to the light sources 30.