To provide a vehicular door lock control device, a vehicular door lock control system, and a door lock control method for the vehicular door lock control device, capable of restraining unintentional locking-unlocking operation of a user.

A receiver receives a transmission signal S outputted from a portable machine 12 by pressing and operating a switch once in a predetermined time; detects that an occupant stays in a non-driver's seat by a person detecting sensor before stopping an engine; detects that there is opening-closing of a door corresponding to a driver's seat by a D seat door opening-closing detecting sensor after stopping the engine; and controls unlocking of a door lock of the whole seats, when detecting that there is no opening-closing of the door corresponding to the non-driver's seat by the door opening-closing detecting sensor after stopping the engine.