The invention relates to an infusion set for introducing liquid medicaments into the body of a patient. The infusion set comprises a first structural part (1) with a cannula (2) protruding from it, and a second structural part (3) with a connection port (4) for the connector (5) of a supply line (6). The first structural part (1) and the second structural part (3) are designed in such a way, and connected to each other in such a way, that they are inseparable and are able to rotate relative to each other and, in each relative position of rotation, form a channel (7) for delivering a liquid from the connection port (4) to the cannula (2) or for withdrawing a liquid from the cannula (2) to the connection port (4). In addition, the connection port (4) is arranged on the second structural part (3) in such a way that the coupling and uncoupling of the connector (5) in each case take place in a direction transverse to the longitudinal axis of the cannula (2). By means of the invention, it is possible to make available infusion sets which offer a high level of comfort to the wearer and which at the same time are safe against operating errors.