A motor vehicle door lock apparatus (1F, 1R), comprising: a meshing mechanism (5, 6) configured to mesh with a striker to thereby hold a door (FD, RD) in a closed state; a locking and unlocking mechanism (14, 15, 16, 18) configured to be selectively switched to an unlocking state, where a meshing of the meshing mechanism (5, 6) can be released, and a locking state, where a meshing of the meshing mechanism (5, 6) cannot be released, by a locking and unlocking motor as a drive source being driven; an inside electric operation element (SW2, SW4) provided on an inner side of the door (FD, RD); 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 (SW2, SW4) when the transmitter is authenticated; and an electric releasing mechanism (22, 23, 24) configured to release a meshing of the meshing mechanism (14, 15, 16, 18) by the control unit driving a releasing motor to activate a releasing operation based on the operation of the inside electric operation element (SW2, SW4) 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 (OA1, OA2) on the outer side of the door (FD, RD), 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 moved from the inside to the outside of the predetermined area (OA1, OA2), drive the locking and unlocking motor to activate a locking operation so as to switch the locking and unlocking mechanism (14, 15, 16, 18) to the locking state. a meshing mechanism (5, 6) configured to mesh with a striker to thereby hold a door (FD, RD) in a closed state; a locking and unlocking mechanism (14, 15, 16, 18) configured to be selectively switched to an unlocking state, where a meshing of the meshing mechanism (5, 6) can be released, and a locking state, where a meshing of the meshing mechanism (5, 6) cannot be released, by a locking and unlocking motor as a drive source being driven; an inside electric operation element (SW2, SW4) provided on an inner side of the door (FD, RD); 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 (SW2, SW4) when the transmitter is authenticated; and an electric releasing mechanism (22, 23, 24) configured to release a meshing of the meshing mechanism (14, 15, 16, 18) by the control unit driving a releasing motor to activate a releasing operation based on the operation of the inside electric operation element (SW2, SW4) 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 (OA1, OA2) on the outer side of the door (FD, RD), 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 moved from the inside to the outside of the predetermined area (OA1, OA2), drive the locking and unlocking motor to activate a locking operation so as to switch the locking and unlocking mechanism (14, 15, 16, 18) to the locking state. in a case where the transmitter outside the motor vehicle is disposed within a predetermined area (OA1, OA2) on the outer side of the door (FD, RD), 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 moved from the inside to the outside of the predetermined area (OA1, OA2), drive the locking and unlocking motor to activate a locking operation so as to switch the locking and unlocking mechanism (14, 15, 16, 18) to the locking state.