A method of unlocking an electronic lock capable of saving a labor by unmanning
a system on the side of an object to be unlocked and increasing a security, comprising
the step of unlocking by using a radio and a plurality of identification codes,
wherein a cashbox (10) transmits ID=A as ID1, a first electronic
lock device (20) transmits ID=B as ID2 when receiving ID=A as ID,
a second electronic lock device (30) transmits ID=C as ID3 when receiving
ID=B as ID, and the cashbox (10) performs an unlocking operation when receiving
ID=C as ID.
