To provide a remote controller and a toy to be operated securely in response to the sound even if far apart from the sound source, permitting miniaturization of an object to be operated, and capable of controlling the object to be operated to make complicated motions.

The remote controller comprises a transmission device for generating an operation command signal according to the frequency of a sound signal and radio-transmitting the generated operation command signal, and a receiving device disposed in a casing different from the transmission device for receiving the operation command signal transmitted from the transmission device and outputting a driving control signal corresponding to the received operation signal.