The invention relates to a strain relief for a cable harness, which is used to connect a part to electrical and/or electronic components, wherein the cable harness has at least two wires and wherein a stop component, is provided, which is made of plastic and tightly encloses the wires such that the stop component (20) is fixed immovably on the wires. The invention also relates to a part with a housing, a cable harness, which is guided into the housing, and a strain relief according to one of the preceding claims, wherein the housing has a receiver for the stop component, in which the latter is received in a positively-locking manner in at least one tensile direction.