Rotor of a wind turbine, comprising a rotor blade (2a, 2b) and a hub, - whereby the rotor blade (2a, 2b) comprises a root end and the root end is attached to a rotor blade bearing, and the rotor blade bearing is attached to the hub, - whereby the rotor blade comprises a root section, adjacent to the root end, comprising the outer surface of the rotor blade (2a, 2b), - whereby the root section of the rotor blade (2a, 2b) is covered by a housing, - whereby the housing comprises a wall section that leads at least partially circumferentially around the root section of the rotor blade (2a, 2b), - whereby the housing comprises a cover section to at least partially close the gap between the wall section of the housing and the rotor blade (2a, 2b), - whereby the housing defines an aisle that leads circumferentially around the root section of the rotor blade (2a, 2b) to provide access to the blade bearing and to allow a worker to perform service work at the blade bearing, characterized in that: - the rotor comprises a cavity suitable for a worker to pass through, and the cavity is in communication with the aisle by at least a manhole, - the wall of the housing comprises an opening to access the aisle in the housing, and - the cavity of the rotor is in the hub, whereby the wall of the hub comprises a manhole and the cavity is in communication with the opening in the wall of the housing by the manhole and a channel that is suitable for a worker to pass through. - whereby the rotor blade (2a, 2b) comprises a root end and the root end is attached to a rotor blade bearing, and the rotor blade bearing is attached to the hub, - whereby the rotor blade comprises a root section, adjacent to the root end, comprising the outer surface of the rotor blade (2a, 2b), - whereby the root section of the rotor blade (2a, 2b) is covered by a housing, - whereby the housing comprises a wall section that leads at least partially circumferentially around the root section of the rotor blade (2a, 2b), - whereby the housing comprises a cover section to at least partially close the gap between the wall section of the housing and the rotor blade (2a, 2b), - whereby the housing defines an aisle that leads circumferentially around the root section of the rotor blade (2a, 2b) to provide access to the blade bearing and to allow a worker to perform service work at the blade bearing, characterized in that: - the rotor comprises a cavity suitable for a worker to pass through, and the cavity is in communication with the aisle by at least a manhole, - the wall of the housing comprises an opening to access the aisle in the housing, and - the cavity of the rotor is in the hub, whereby the wall of the hub comprises a manhole and the cavity is in communication with the opening in the wall of the housing by the manhole and a channel that is suitable for a worker to pass through. - the rotor comprises a cavity suitable for a worker to pass through, and the cavity is in communication with the aisle by at least a manhole, - the wall of the housing comprises an opening to access the aisle in the housing, and - the cavity of the rotor is in the hub, whereby the wall of the hub comprises a manhole and the cavity is in communication with the opening in the wall of the housing by the manhole and a channel that is suitable for a worker to pass through.