The invention relates to a disposable injector with a piston actuation ram which is mounted in a housing, is loaded by means of a spring energy accumulator and can be unlocked by means of a displaceable trigger device, wherein the piston actuation ram can be supported by means of a tensioning rod mounted in the housing. The trigger device comprises a trigger ring displaceable relative to the housing. The tensioning rod can be supported directly or indirectly by means of a bearing surface of the trigger ring. Moreover, the bearing surface encloses an angle of between 10 degrees and 45 degrees with the longitudinal direction of the disposable injector, wherein the point of the angle lies offset with respect to the trigger ring in the triggering direction of the disposable injector. With the present invention, a disposable injector with increased triggering reliability is developed.
