A wireless communication system comprising a master station, and slave stations (2 to 5) configured to execute a predetermined operation based on an operation instruction transmitted by the master station, wherein the master station includes: a normal-frame transmitting unit configured to generate the operation instruction as a wireless frame; and an execution-instruction-signal generating unit configured to generate an execution instruction signal instructing to execute an operation corresponding to the operation instruction, and transmit the thus generated execution instruction signal when a response to the operation instruction is obtained from all the slave stations during a predetermined response waiting time, each of the slave stations includes: an execution-instruction-signal receiving unit configured to receive the execution instruction signal and perform predetermined reception processing, and the execution-instruction-signal receiving unit is configured to execute an operation based on an operation instruction corresponding to the execution instruction signal when receiving the execution instruction signal, or wait execution of the operation based on the operation instruction until the execution instruction signal corresponding to the operation instruction is received; wherein the execution-instruction-signal generating unit is configured to transmit a waiting instruction signal instructing to wait an operation to all the slave stations when a response to the operation instruction is not obtained from one or more slave stations during the response waiting time, and the execution-instruction-signal receiving unit is configured to wait execution of an operation based on an operation instruction corresponding to the waiting instruction signal during a predetermined operation waiting time when receiving the waiting instruction signal. a normal-frame transmitting unit configured to generate the operation instruction as a wireless frame; and an execution-instruction-signal generating unit configured to generate an execution instruction signal instructing to execute an operation corresponding to the operation instruction, and transmit the thus generated execution instruction signal when a response to the operation instruction is obtained from all the slave stations during a predetermined response waiting time, each of the slave stations includes: an execution-instruction-signal receiving unit configured to receive the execution instruction signal and perform predetermined reception processing, and the execution-instruction-signal receiving unit is configured to execute an operation based on an operation instruction corresponding to the execution instruction signal when receiving the execution instruction signal, or wait execution of the operation based on the operation instruction until the execution instruction signal corresponding to the operation instruction is received; wherein an execution-instruction-signal receiving unit configured to receive the execution instruction signal and perform predetermined reception processing, and the execution-instruction-signal receiving unit is configured to execute an operation based on an operation instruction corresponding to the execution instruction signal when receiving the execution instruction signal, or wait execution of the operation based on the operation instruction until the execution instruction signal corresponding to the operation instruction is received; wherein the execution-instruction-signal generating unit is configured to transmit a waiting instruction signal instructing to wait an operation to all the slave stations when a response to the operation instruction is not obtained from one or more slave stations during the response waiting time, and the execution-instruction-signal receiving unit is configured to wait execution of an operation based on an operation instruction corresponding to the waiting instruction signal during a predetermined operation waiting time when receiving the waiting instruction signal.