Abstract: The invention relates to a positioning device for moving a rotor of a wind power station, comprising at least one support means (28) and a drive device (19) via which the torque active in the direction of the rotational axis (10) of the rotor can be produced. Said support means (28) support a rotational part (9) of the wind power station. The positioning device comprises a catch (40) which can be at least partially pivoted by the drive device (19), said pivoting enabling the support means (28) to be guided into or out from the support position. Said catch (40) can be moved into the support position by the drive device (19) such that the parts (9) which rotate move together. The invention also relates to a wind power station comprising said above-described positioning device.