Abstract: A connecting device for pipes conducting pressure medium, having a sleeve-like insert part which can be inserted in a frictional or form-fitting manner into a connecting opening in a connecting body and surrounding a receiving opening for a pipe to be inserted, a sealing element for producing a seal between the connecting body and the pipe, and a holding element with holding arms which extend radially inwardly into the receiving opening. A release sleeve engages displaceably in the insert part in such a manner that by pushing in the release sleeve, the holding element is deformed elastically for releasing the pipe. The holding element is held by an outer circumferential region in an essentially clearance-free manner axially relative to the insert part, so that elastic deformation takes place in the region of the holding arms when inserting or releasing the pipe.