To provide short-distance radio transmitting equipment wherein, when two transmission modules conduct acknowledgements between them, pin codes used therefor can be formed accurately using a simple method.

In the short-distance radio transmitting equipment, there are performed a step for setting a connection with the other party side transmitting module whereto radio transmission is performed among a plurality of transmitting modules, a step for conducting acknowledgements each other by exchanging pin codes between the transmitting modules subjected to the connection settings, and a step for assigning thereafter a plurality of high-frequency channels in a specific order by spectral hoppings to transmit high-frequency radio signals bidirectionally. Each transmitting module has a high-frequency signal transmitting and receiving portion 1 for transmitting and receiving the high-frequency radio signals, a data processing portion 3 for processing transmitted and received data, a control portion 7, and a clocking portion 8 for setting a inherent time in the transmitting module. The control portion 7 uses the set time of the clocking portion 8 when exchanging the pin codes with the other party side transmitting module to acknowledge the other party side transmitting module by the coincidence of the set time of the clocking portion 8 with the one of the clocking portions of the other party side transmitting module.