Abstract: A wireless communication apparatus for transmitting signals between a plurality of controllers and a master unit in a wireless fashion and a game machine using the wireless communication apparatus are disclosed, wherein different delay times are set for the respective controllers, each of the controllers comprises a first receiver for receiving a reference time signal from the master unit, an input device for inputting an operating signal by a user and a first transmitter for transmitting the operating signal to the master unit at the delay time set for the controller after receiving the reference time signal and the master unit comprises a reference time signal generator for repeatedly generating the reference time signal, a second transmitter for transmitting the reference time signal to each controller, a second receiver for receiving the operating signal transmitted from each of the controllers and a discriminator for taking out output signals from the signals received by the second receiver, respectively