Rotor vacuum pump, and, with the rotor

A and improve the exhaust performance of the vacuum pump, suitable rotor to achieve the captive debris from balancing unit, and to provide a vacuum pump equipped with the rotor. And exhaust performance of the vacuum pump, improving the workability of the balancing, as well as drop-off prevention and debris from balancing unit, early discharge, suitable vacuum pump to ensure prompt rotor when it has any chance falling to provide and the like. A rotor 6 of the vacuum pump P1 is provided with a first and a second cylindrical body 61, a connecting portion 60 for connecting the ends to each other of the two tubular bodies 61 and 62. The first cylindrical body 61 is provided with a plurality of rotor blades 13 on its outer peripheral surface, that the plurality of rotor blades 13 are alternately arranged in a plurality of fixed vanes 14 along the vacuum pump axis, wings It constitutes the exhaust part Pt. The second cylindrical body 62, at least, on the inner peripheral side thereof, by forming a thread groove exhaust passage R1, forming a thread groove exhaust portion Ps. Then, in the rotor 6, the inner peripheral surface of the first cylindrical body 61 or the connecting portion 60, a balancing portion K1 of the rotor 6 is provided, on the balancing unit K1, providing mass adding means M. .FIELD 1