To enable the number search of a dial lock to be performed easily from the front side of the lock using a spare key.

The number of the dial lock 1 is set to be an intended unlocking number in the door-opened state where a hook arm 4 is housed. A finger grip 2 is turned and the hook arm 4 is engaged with a hook receiving hole of a locker body to obtain a door-closed state. When the number of the dial lock 1 is changed, the locked state is obtained where the finger grip 2 can not be turned. When the number of the dial lock 1 is tuned to the unlocking number in the locked state, a door-closed state is obtained where the finger grip 2 can be turned. When a user forgets the unlocking number, a cylinder lock 3 is unlocked with a spare key to obtain a number search state, and a dial 11 is turned to search the unlocking number. Since the position where the dial 11 is stopped is the unlocking number, the cylinder lock 3 is restored to a normal state and the spare key is removed to obtain the door-opened state.