Abstract: An open-end spinning device (1) with a spinning rotor (17) which is mounted with its rotor shaft (8) in the V-slots of a support-disk bearing (5) and whose spinning cup (17) rotates at a high speed in a rotor housing (6) which is open to the front and can be loaded by suction. The rotor housing (6) can be closed by a pivotably mounted cover element (10) which comprises a sliver opening device and is arranged so that it can be disengaged if required. The cover element (10) can be attached to the spinning box (2) via a mounting device (20) comprising fork-shaped connecting brackets (22) and pivot bolts (30) rotatably seated in the housing wall (38) of the open-end spinning device (1). If required, the cover element (10) can be easily removed after securing means (32), which are easily accessible, have been loosened.