The invention relates to a disposable injector comprising a housing, a spring-loaded piston-actuating plunger arranged in said housing and able to be released by means of a trigger unit, and a cylinder-piston unit comprising a cylinder and a piston that is positioned at a distance from said piston-actuating plunger. A closed layer (140) made of an elastically-deformable material surrounds the piston-actuating plunger in at least some sections and projects beyond same in the trigger direction. The aim of the invention is to design a disposable injector such that the patient will not be alarmed during use thereof.
