To obtain a receiver circuit unit for radio controlled toys configured such that the drive of a plurality of types of radio controlled toys can be controlled by a single transmitter by removably mounting the receiver circuit unit as a separate item. To provide a receiver circuit unit for radio controlled toys configured such that a receiver circuit unit mounting portion is provided in each of a plurality of types of radio controlled toys containing a drive mechanism, and a single receiver circuit unit is interchangeably and removably mounted on the receiver circuit unit mounting portion, whereby the drive of the plurality of types of radio controlled toys can be controlled by a single transmitter.