To provide a locking device for storage box such that when a user has pressed operation buttons for a correct unlock number, the operation buttons having been pressed return into original states.

A locking device for storage box includes: an operation rotor 8 which drives a front rotor 7; an operation ring 9 which drives the operation rotor 8; a hook part which is engaged with the operation rotor 8 and can be disengaged from the operation rotor 8 by turning the operation rotor 8; a correct push bar 11 having an elastic projection part that a claw part of the front rotor 7 driven to one side abuts on not in a pushed-in state, and the claw part of the front rotor 7 move over when the rotor is driven to the other side; a hook part which is engaged with the operation rotor 8 and can be disengaged from the operation rotor 8 by turning the operation rotor 8; and a wrong push bar 12 having a projection part that the claw part of the rotor 7 driven to the one side abuts on in the pressed-in state.