A method for manufacturing a structural part with a cannula for the subcutaneous administration of an active substance is disclosed. A loose cannula is threaded on a piercing means to form a ready-to-use cannula piercing unit and subsequently, a cannula housing is injection-molded onto the cannula. Embodiments for the cannula as well as the structural part, an application part, an insertion head, and an insertion device which includes the cannula are also disclosed.
