An attachment for a syringe or carpule includes a main body that encloses an interior space, into which a protrusion of the syringe or carpule can be inserted. The main body has a jacket surrounding the interior space, and includes an inner body connected to the jacket and arranged coaxially thereto. The inner body has an inner wall that, in the attached state of the attachment, contacts an outer surface of the protrusion or of the syringe or carpule by means of an interior surface facing the interior space. The inner wall of the inner body is connected to the jacket of the attachment by a number of webs. At least one web encloses an angle together with an imaginary radially extending line, the angle being greater than 0° and acute.
