Vehicle door lock device

A vehicle door lock device for a door of a vehicle, the vehicle door lock device comprising:

• a mechanical changeover mechanism switchable between a mechanical lock mode in which a motion of a door handle lever is not transmitted to a latch and a mechanical unlock mode in which the motion of the door handle lever is transmitted to the latch;
• an actuator capable of causing the mechanical changeover mechanism to switch from the mechanical unlock mode to the mechanical lock mode;
• and
• a controller configured to control the actuator, wherein the controller is configured to:
• when the controller has determined that any one of a plurality of conditions for re-locking is met and the mechanical changeover mechanism has switched from the mechanical lock mode to the mechanical unlock mode, immediately activate the actuator to cause the mechanical changeover mechanism to switch from the mechanical unlock mode to the mechanical lock mode,
• determine whether a predetermined monitoring time period has expired since the mechanical changeover mechanism has switched from the mechanical lock mode to the mechanical unlock mode,
• upon determining that the predetermined monitoring time period has expired, activate the actuator to cause the mechanical changeover mechanism to switch from the mechanical unlock mode to the mechanical lock mode, and
• upon determining that one or more of the plurality of conditions for re-locking have been met before the predetermined monitoring time period has expired, immediately activate the actuator to cause the mechanical changeover mechanism to switch from the mechanical unlock mode to the mechanical lock mode.