To dissolve such problems that assigned coin changing operation is troublesome and that it takes plenty of time to change into a return type of returning coins after use and a type not in need of coins in a lock device using coins.

In this lock device A, a locking plate 6 protruded from and recessed into a case 1 is provided with a holding part 13 protruded and recessed on one side of a coin passage 10, and coin primary holding mechanism with a space formed to hold and pass a coin C by a coin guide 17 and the holding part 13 is formed on the other side of the coin passage 10. In this case, positioning notches are provided at the internal wall surface of a guide path 14 provided on the other side of the coin passage 10, and the coin guide 17 inserted in the guide path 14 and movable toward the coin passage 10 is provided with a protruding part selectively engaged with and disengaged from the positioning notches so as to form a space corresponding to the coin C.