A vacuum pump, in particular a turbomolecular vacuum pump, comprising - an inlet; - an outlet; - a housing which encloses a pump space for a gas to be pumped from the inlet to the outlet in a pump direction; and - at least one Holweck pump stage (19, 21) which comprises at least one Holweck stator (23, 25) and at least one Holweck rotor which rotates about an axis of rotation during operation and which bounds a Holweck pump region (27, 29) together with the Holweck stator (23, 25), wherein the Holweck pump region (27, 29) has, with respect to the axis of rotation, an axial length having a first axial end and a second axial end, wherein at least one further inlet for gas to be pumped is provided and leads via an inlet channel to an opening, formed in the Holweck stator, of the further inlet into the Holweck pump region, wherein the opening is disposed in the axial direction between the first axial end and the second axial end of the Holweck pump region and the inlet channel comprises at least one opening section (39, 41) which is formed in the Holweck stator and which leads up to the opening into the Holweck pump region, wherein at least one further Holweck pump stage is provided in addition to the Holweck pump stage, wherein these at least two Holweck pump stages (19, 21) are arranged concentrically with respect to the axis of rotation forming a common axis of rotation and are arranged after one another in the pump direction and comprise at least two Holweck stators (23, 25), of which the one is arranged radially within the other, and wherein the opening and the opening section (39, 41) extending up to the opening are formed in the radially inner Holweck stator. - an inlet; - an outlet; - a housing which encloses a pump space for a gas to be pumped from the inlet to the outlet in a pump direction; and - at least one Holweck pump stage (19, 21) which comprises at least one Holweck stator (23, 25) and at least one Holweck rotor which rotates about an axis of rotation during operation and which bounds a Holweck pump region (27, 29) together with the Holweck stator (23, 25), wherein the Holweck pump region (27, 29) has, with respect to the axis of rotation, an axial length having a first axial end and a second axial end, wherein at least one further inlet for gas to be pumped is provided and leads via an inlet channel to an opening, formed in the Holweck stator, of the further inlet into the Holweck pump region, wherein the opening is disposed in the axial direction between the first axial end and the second axial end of the Holweck pump region and the inlet channel comprises at least one opening section (39, 41) which is formed in the Holweck stator and which leads up to the opening into the Holweck pump region, wherein at least one further Holweck pump stage is provided in addition to the Holweck pump stage, wherein these at least two Holweck pump stages (19, 21) are arranged concentrically with respect to the axis of rotation forming a common axis of rotation and are arranged after one another in the pump direction and comprise at least two Holweck stators (23, 25), of which the one is arranged radially within the other, and wherein the opening and the opening section (39, 41) extending up to the opening are formed in the radially inner Holweck stator. wherein the Holweck pump region (27, 29) has, with respect to the axis of rotation, an axial length having a first axial end and a second axial end, wherein at least one further inlet for gas to be pumped is provided and leads via an inlet channel to an opening, formed in the Holweck stator, of the further inlet into the Holweck pump region, wherein the opening is disposed in the axial direction between the first axial end and the second axial end of the Holweck pump region and the inlet channel comprises at least one opening section (39, 41) which is formed in the Holweck stator and which leads up to the opening into the Holweck pump region, wherein at least one further Holweck pump stage is provided in addition to the Holweck pump stage, wherein these at least two Holweck pump stages (19, 21) are arranged concentrically with respect to the axis of rotation forming a common axis of rotation and are arranged after one another in the pump direction and comprise at least two Holweck stators (23, 25), of which the one is arranged radially within the other, and wherein the opening and the opening section (39, 41) extending up to the opening are formed in the radially inner Holweck stator.