The invention relates to a disposable injector with a housing (10) in which arearranged at least one mechanical spring energy store (50), at least one cylinder-pistonunit that can be filled at least temporarily with an active substance, at leastone piston actuation plunger (60) and at least one triggering unit (80). The springenergy store comprises at least one pre-loaded spring element. The spring-loadedpiston actuation plunger has at least one traction rod (61) which can be movedtransversely, at least in certain regions, and by means of a supporting portionsupports the tensioned spring energy store on at least one resting surface (37)of the housing. An actuatable triggering slide device (82) unlocks the disposableinjector and releases the supporting portion to allow it to move away from theresting surface.
