A wireless communication authentication program whereby a slave station in a small-scale wireless LAN system can be authenticated by a simple procedure. A wireless communication authentication device periodically increments a first system timer value (Step S1) for which an optional numerical value is set beforehand. A wireless communication device sets therein a second system timer value (Step S2) so as to coincide with the first system timer value and periodically increments the second system timer value (Step S3). The wireless communication device transmits an authentication request command including a third system timer value (Step S4), and the wireless communication authentication device compares the third system timer value included in the authentication request command with the first system timer value thereof assumed at the time of reception of the command (Step S6). In accordance with the comparison result, the wireless communication authentication device determines whether to authenticate the wireless communication device.