To provide a door lock device excellent in crime preventing effect by closing the operation portion of a door lock with a protective cover, and preventing a door from being opened by only a duplicate key.

The keyway 10a of a cylinder lock 10 forming the door lock is closed with the protective cover 41. This door lock device is provided with a lock member 30 for keeping the protective cover 41 in a closed state and a dial lock 70 for regulating the action of the lock member 30 kept at the coupled state with the protective cover 41. The dial lock 70 is provided with an action shaft made reciprocatable by unlocking and made non-reciprocatable by locking. One end of the action shaft forms a stopper enabling the action of the lock member 30 in the reciprocatable state of the action shaft and disabling the action of the lock member 30 in the non-reciprocatable state of the action shaft.