A remote-control toy is provided that includes: a controller that transmits a control signal containing an operating instruction based on an operation instruction by a user; a driving device that is driven and controlled based on the control signal; and an extension unit that is capable of receiving the control signal. The extension unit includes: a unit main body and a signal processing device that can be detachably connected to the unit main body. In the unit main body, the received control signal is output to the signal processing device, and processing according to an instruction signal output from the signal processing device is performed. In the signal processing device, the contents of the operating instruction contained in the control signal that is output from the unit main body are discriminated, and an instruction signal based on the operation corresponding to the contents is output to the unit main body.