A capillary connection unit for analysis devices and medical devices includes a capillary having at least one end section and a free end, at least one connection element arranged on the end section of the capillary, wherein the connection element has an axial guide-through for the capillary, a sealing element surrounding the capillary, and a metal sleeve element which radially externally surrounds the sealing element and which has a first end facing the connection element and a receiving region facing away from the connection element, wherein the connection element is configured to be detachably connected to a counter element and to exert an axial thrust force onto the sealing element.