Connection device (300; 400; 500; 700) for at least one cable (490; 590; 790) for connection with a coupling or a plug socket, comprising: - an end housing (100; 310; 410; 510; 710) with a rear end and a front end for connection with a coupling housing or a plug socket housing, - wherein the end housing (100; 310; 410; 510; 710) has two plane supporting surfaces (110; 320; 720) which extend in the longitudinal direction of the end housing (100; 310; 410; 510; 710) and are arranged on two opposing sides of the end housing (100; 310; 410; 510; 710) and run parallel to one another, and - a cable cage (200; 350; 450; 550; 750) which is fastened to the end housing (100; 310; 410; 510; 710) so as to be able to swivel about a predetermined axis and protrudes over the rear end of the end housing (100; 310; 410; 510; 710), wherein the cable cage (200; 350; 450; 550; 750) serves as strain-relief for the cable (490; 590; 790), wherein the cable cage (200; 350; 450; 550; 750) has two limbs (210; 370; 470; 570; 770), and each limb (210; 370; 470; 570; 770) is supported on one of the two supporting surfaces (110; 320; 720), characterised in that - at least one of the two supporting surfaces (110; 320; 720) is embodied in the form of a recess which is located on the outside of the end housing (100; 310; 410; 510; 710) and extends in the longitudinal direction of the end housing (100; 310; 410; 510; 710), wherein the recess comprises a straight first section and a second section which widens to the rear end of the end housing (100; 310; 410; 510; 710), and - the first section and the second section of the recess and the limbs (210; 370; 470; 570; 770) are embodied in such a way that for fastening of the cable cage (200; 350; 450; 550; 750) in a fixed position in the longitudinal direction at least one of the limbs (210; 370; 470; 570; 770) can be slid along its supporting surface into the straight first section of the recess in the direction of the front end of the end housing (100; 310; 410; 510; 710) and fixed there on both sides by walls of the recess, and that to position the cable cage at an angle at least one of the limbs (210; 370; 470; 570; 770) can be moved in the direction of the rear end of the end housing until the limb leaves the area of the straight first section and is essentially located in the second section through which the cable cage (200; 350; 450; 550; 750) can be swivelled. - an end housing (100; 310; 410; 510; 710) with a rear end and a front end for connection with a coupling housing or a plug socket housing, - wherein the end housing (100; 310; 410; 510; 710) has two plane supporting surfaces (110; 320; 720) which extend in the longitudinal direction of the end housing (100; 310; 410; 510; 710) and are arranged on two opposing sides of the end housing (100; 310; 410; 510; 710) and run parallel to one another, and - a cable cage (200; 350; 450; 550; 750) which is fastened to the end housing (100; 310; 410; 510; 710) so as to be able to swivel about a predetermined axis and protrudes over the rear end of the end housing (100; 310; 410; 510; 710), wherein the cable cage (200; 350; 450; 550; 750) serves as strain-relief for the cable (490; 590; 790), wherein the cable cage (200; 350; 450; 550; 750) has two limbs (210; 370; 470; 570; 770), and each limb (210; 370; 470; 570; 770) is supported on one of the two supporting surfaces (110; 320; 720), - at least one of the two supporting surfaces (110; 320; 720) is embodied in the form of a recess which is located on the outside of the end housing (100; 310; 410; 510; 710) and extends in the longitudinal direction of the end housing (100; 310; 410; 510; 710), wherein the recess comprises a straight first section and a second section which widens to the rear end of the end housing (100; 310; 410; 510; 710), and - the first section and the second section of the recess and the limbs (210; 370; 470; 570; 770) are embodied in such a way that for fastening of the cable cage (200; 350; 450; 550; 750) in a fixed position in the longitudinal direction at least one of the limbs (210; 370; 470; 570; 770) can be slid along its supporting surface into the straight first section of the recess in the direction of the front end of the end housing (100; 310; 410; 510; 710) and fixed there on both sides by walls of the recess, and that to position the cable cage at an angle at least one of the limbs (210; 370; 470; 570; 770) can be moved in the direction of the rear end of the end housing until the limb leaves the area of the straight first section and is essentially located in the second section through which the cable cage (200; 350; 450; 550; 750) can be swivelled.