Automobile door locking device

A motor vehicle door lock apparatus, comprising:

• a meshing mechanism configured to mesh with a striker to thereby hold a door in a closed state;
• a locking and unlocking mechanism configured to be selectively switched to an unlocking state where a meshing of the meshing mechanism can be released and a locking state where a meshing of the meshing mechanism cannot be released by a locking and unlocking motor as a drive source being driven;
• an inside electric operation element provided on an inner side of the door;
• a control unit configured to authenticate a transmitter based on a signal emitted by the transmitter, wherein the control unit is configured to enable an operation of the inside electric operation element when the transmitter is authenticated;
• and
• an electric releasing mechanism configured to release a meshing of the meshing mechanism by the control unit driving a releasing motor to activate a releasing operation based on the operation of the inside electric operation element when the control unit authenticates the transmitter,
• wherein the control unit is configured to:
• in a case where the transmitter outside the motor vehicle is disposed within a predetermined area on the outer side of the door, authenticate the transmitter;
• and
• in response to the transmitter outside the motor vehicle being switched from the authenticated state to a non-authenticated state when the transmitter is dislocated from the predetermined area, drive the locking and unlocking motor to activate a locking operation so as to switch the locking and unlocking mechanism to the locking state.