To provide illuminating apparatus, which can be used anywhere, can take drip-proof measures, and can reproduce peculiar fluctuation which flame of a candle has.

For example, an electric signal, which synchronizes with sound generated at random, is made to transmit and amplify by using a sound collector, such as a condenser microphone. Moreover, the electric signal, which has a fixed waveform and is continuous is transmitted, and these two kinds of electric signals are compared by a comparator, and the pulse signal based on the comparison result is generated. Furthermore, the light source is driven using a field effect transistor, so that it may synchronize with the pulse waveform.