Injection site for tubular medical connectors (1), comprising a perforable body (7) inserted in a seat (4) of the connector (1) delimited by an annular wall (5) having a retention edge (8) turned in against the outer end (9) of the perforable body (7), said outer end (9) being formed with a peripheral annular step and with an exposed portion with reduced cross section (11) projecting axially. The peripheral step is defined by an annular groove having a shape complementary to that of the turned-in retention edge (8) of the connector (1), and the portion with reduced cross section (11) of the perforable body (7) connects up to the groove (12) through an annular surface (13) projecting radially above at least part of the turned- in retention edge (8) and resting against it.
