A door lock device comprising: a latch mechanism adapted to latch a door of a vehicle in a closed state; a handle interlock lever normally positioned at an original position and adapted to rotate to an operation position upon receiving an operation force relative to a door handle of the vehicle; an open link tiltably connected to a position in the handle interlock lever which is away from a rotational center of the handle interlock lever, the open link being switchable between an unlocked state in which the open link is positioned at an unlock position at which the open link pushes a latch release portion included in the latch mechanism and unlatches the door when the handle interlock lever rotates to the operation position, and a locked state in which the open link is positioned at a lock position at which the open link passes a lateral side of the latch release portion and does not unlatch the door when the handle interlock lever rotates to the operation position; characterized by a tilt biasing spring biasing the open link towards the unlock position; a link waiting position determination portion positioning the open link at a lock waiting position when the handle interlock lever is arranged at the original position in the locked state, the link waiting position determination portion allowing the open link to be tilted towards the unlock position by a biasing of the tilt biasing spring in the middle of movement of the handle interlock lever from the original position to the operation position; a link operation position determination portion making contact with the open link in the middle of the movement of the handle interlock lever from the original position to the operation position in the locked state, preventing the open link from tilting to the unlock position, and keeping the open link at the lock position; and a sliding-contact tilt guide (87, 89T) making sliding-contact with the open link and causing the open link to tilt towards the lock position at a time of malfunction when the handle interlock lever rotates from the original position to the operation position in a state where the open link is maintained at the lock waiting position. a latch mechanism adapted to latch a door of a vehicle in a closed state; a handle interlock lever normally positioned at an original position and adapted to rotate to an operation position upon receiving an operation force relative to a door handle of the vehicle; an open link tiltably connected to a position in the handle interlock lever which is away from a rotational center of the handle interlock lever, the open link being switchable between an unlocked state in which the open link is positioned at an unlock position at which the open link pushes a latch release portion included in the latch mechanism and unlatches the door when the handle interlock lever rotates to the operation position, and a locked state in which the open link is positioned at a lock position at which the open link passes a lateral side of the latch release portion and does not unlatch the door when the handle interlock lever rotates to the operation position; characterized by a tilt biasing spring biasing the open link towards the unlock position; a link waiting position determination portion positioning the open link at a lock waiting position when the handle interlock lever is arranged at the original position in the locked state, the link waiting position determination portion allowing the open link to be tilted towards the unlock position by a biasing of the tilt biasing spring in the middle of movement of the handle interlock lever from the original position to the operation position; a link operation position determination portion making contact with the open link in the middle of the movement of the handle interlock lever from the original position to the operation position in the locked state, preventing the open link from tilting to the unlock position, and keeping the open link at the lock position; and a sliding-contact tilt guide (87, 89T) making sliding-contact with the open link and causing the open link to tilt towards the lock position at a time of malfunction when the handle interlock lever rotates from the original position to the operation position in a state where the open link is maintained at the lock waiting position.