A vehicle door lock device (Ao), comprising: an open mechanism adapted to be actuated in such a manner that a vehicle door is openable relative to a vehicle body; a lock mechanism provided with an active lever capable of driving a lock/unlock member placed in the open mechanism at a locking position or an unlocking position, the lock mechanism for restraining or permitting an action of the open mechanism so as to lock or unlock the door; an electric actuator for driving the lock/unlock member at the locking position or the unlocking position through the active lever; and a housing accommodating the open mechanism, the lock mechanism, and the electric actuator, wherein the electric actuator includes: an electric motor driven in accordance with a lock operation and an unlock operation; a worm provided integrally with an output shaft of the electric motor, the worm being rotated and driven by the electric motor; and a locking lever having a sector gear meshed with the worm, the locking lever being linked with the active lever, rotatably assembled into the housing, and provided with an engagement portion having a predetermined arm length to be coupled to the active lever, characterized in that the locking lever is provided with an operation portion adapted to be linked with a lock knob provided on the indoor side of the door, the lock knob being operable to set the lock/unlock member at the locking position; and the operation portion is provided integrally with the sector gear so as to be tilted integrally with the sector gear. an open mechanism adapted to be actuated in such a manner that a vehicle door is openable relative to a vehicle body; a lock mechanism provided with an active lever capable of driving a lock/unlock member placed in the open mechanism at a locking position or an unlocking position, the lock mechanism for restraining or permitting an action of the open mechanism so as to lock or unlock the door; an electric actuator for driving the lock/unlock member at the locking position or the unlocking position through the active lever; and a housing accommodating the open mechanism, the lock mechanism, and the electric actuator, wherein the electric actuator includes: an electric motor driven in accordance with a lock operation and an unlock operation; a worm provided integrally with an output shaft of the electric motor, the worm being rotated and driven by the electric motor; and a locking lever having a sector gear meshed with the worm, the locking lever being linked with the active lever, rotatably assembled into the housing, and provided with an engagement portion having a predetermined arm length to be coupled to the active lever, characterized in that the locking lever is provided with an operation portion adapted to be linked with a lock knob provided on the indoor side of the door, the lock knob being operable to set the lock/unlock member at the locking position; and the operation portion is provided integrally with the sector gear so as to be tilted integrally with the sector gear. an electric motor driven in accordance with a lock operation and an unlock operation; a worm provided integrally with an output shaft of the electric motor, the worm being rotated and driven by the electric motor; and a locking lever having a sector gear meshed with the worm, the locking lever being linked with the active lever, rotatably assembled into the housing, and provided with an engagement portion having a predetermined arm length to be coupled to the active lever, characterized in that the locking lever is provided with an operation portion adapted to be linked with a lock knob provided on the indoor side of the door, the lock knob being operable to set the lock/unlock member at the locking position; and the operation portion is provided integrally with the sector gear so as to be tilted integrally with the sector gear.