An automotive door lock device comprises a lock proper having a latch mechanism installed therein. A main cover plate is fixed to the lock proper. The main cover plate has therein an interchanger mechanism operatively engaged with the latch mechanism. A socket structure is defined by the main cover plate. The socket structure has a terminal member of the interchanger mechanism exposed to an interior of the socket structure. An auxiliary cover plate has a shape to be detachably held by the socket structure and has an actuating member installed thereto. The actuating member is brought into an operative connection with the terminal member when the auxiliary cover plate is properly held by the socket structure.
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