A door lock device pair applied to a vehicle, the door lock device pair comprising: a right door lock device; and a left door lock device, wherein each of the right door lock device and the left door lock device includes: housings formed in a casing (14R,14L), a cover (16R,16L) and a waterproof cover (20R,20L); a coupler wall formed in a tubular shape and projecting from the cover (16R,16L); a flat portion (36R,36L) formed in a periphery of the coupler wall and formed in an extending manner over an upper flat portion (36Ra,36La) that is a part of the waterproof cover (20R,20L) and a lower flat portion (36Rb,36Lb) that is a part of the cover (16R,16L) and a waterproof seal fixed to the flat portion (36R, 36L) and being wrapped around and cover an outer peripheral wall of the coupler wall, the waterproof seal includes: an inner peripheral surface; an outer peripheral surface; wherein the waterproof seal further includes an inclined surface that forms an acute angle with respect to the inner peripheral surface at one end of the inclined surface and forms an obtuse angle with respect to the outer peripheral surface at another end of the inclined surface, the inner peripheral surface is brought into contact with the outer peripheral wall of the coupler wall in an extending manner around the outer peripheral wall of the coupler wall and further brought into contact with the inclined surface, and the waterproof seals in the right door lock device and the left door lock device have respective shapes identical to each other, and the waterproof seals are wrapped around the respective outer peripheral walls of the coupler walls in the respective directions identical to each other, characterized in that the lower flat portions (36Rb, 36Lb) in the right door lock device and the left door lock device have respective shapes identical to each other as viewed in a side view and are of right-and-left asymmetrical configuration, and each of the flat portions (36R,36L) is formed in a shape extending along a fixing surface of the waterproof seal. a right door lock device; and a left door lock device, wherein each of the right door lock device and the left door lock device includes: housings formed in a casing (14R,14L), a cover (16R,16L) and a waterproof cover (20R,20L); a coupler wall formed in a tubular shape and projecting from the cover (16R,16L); a flat portion (36R,36L) formed in a periphery of the coupler wall and formed in an extending manner over an upper flat portion (36Ra,36La) that is a part of the waterproof cover (20R,20L) and a lower flat portion (36Rb,36Lb) that is a part of the cover (16R,16L) and a waterproof seal fixed to the flat portion (36R, 36L) and being wrapped around and cover an outer peripheral wall of the coupler wall, housings formed in a casing (14R,14L), a cover (16R,16L) and a waterproof cover (20R,20L); a coupler wall formed in a tubular shape and projecting from the cover (16R,16L); a flat portion (36R,36L) formed in a periphery of the coupler wall and formed in an extending manner over an upper flat portion (36Ra,36La) that is a part of the waterproof cover (20R,20L) and a lower flat portion (36Rb,36Lb) that is a part of the cover (16R,16L) and a waterproof seal fixed to the flat portion (36R, 36L) and being wrapped around and cover an outer peripheral wall of the coupler wall, the waterproof seal includes: an inner peripheral surface; an outer peripheral surface; wherein the waterproof seal further includes an inclined surface that forms an acute angle with respect to the inner peripheral surface at one end of the inclined surface and forms an obtuse angle with respect to the outer peripheral surface at another end of the inclined surface, an inner peripheral surface; an outer peripheral surface; wherein the waterproof seal further includes an inclined surface that forms an acute angle with respect to the inner peripheral surface at one end of the inclined surface and forms an obtuse angle with respect to the outer peripheral surface at another end of the inclined surface, the inner peripheral surface is brought into contact with the outer peripheral wall of the coupler wall in an extending manner around the outer peripheral wall of the coupler wall and further brought into contact with the inclined surface, and the waterproof seals in the right door lock device and the left door lock device have respective shapes identical to each other, and the waterproof seals are wrapped around the respective outer peripheral walls of the coupler walls in the respective directions identical to each other, characterized in that the lower flat portions (36Rb, 36Lb) in the right door lock device and the left door lock device have respective shapes identical to each other as viewed in a side view and are of right-and-left asymmetrical configuration, and each of the flat portions (36R,36L) is formed in a shape extending along a fixing surface of the waterproof seal.