An injection site for tubular medical connectors, includes a perforable body inserted in a seat of a connector delimited by an annular wall having a retention edge turned in against the outer end of the perforable body. The outer end is formed with a peripheral annular step and with an exposed portion with reduced cross section projecting axially. The peripheral step is defined by an annular groove having a shape complementary to that of the turned-in retention edge of the connector, and the portion with reduced cross section of the perforable body connects up to the groove through an annular surface projecting radially above at least part of the turned-in retention edge and resting against it.
