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1. A peristaltic pump for conveying fluid in an apparatus for extracorporeal blood treatment, the peristaltic pump comprising a pump housing that accommodates a rotor rotatable about a rotor axis, the rotor including at least two squeezing elements offset against each other in a circumferential direction, the pump housing including a support surface extending in a curved shape around the rotor axis, the support surface being radially spaced apart from the rotor and arranged to support a tube segment radially inserted between the rotor and the support surface, the rotor being driven by a rotor shaft, the peristaltic pump further comprising a freewheel press-fitted into a toothed driver sleeve that is configured to transmit rotary movement of the rotor shaft to a rotor base body, the rotor base body comprising a plain bearing position on each side of the freewheel, the plain bearing positions being defined by a geometry of the toothed driver sleeve, with one of the plain bearing positions comprising a bearing ring.
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