Automobile vacuum pump comprising: a pump chamber for compressive rotation of a pump rotor therein, an outlet chamber into which the compressed gas is discharged from the pump chamber, a partition wall separating the pump chamber from the outlet chamber, and at least one outlet valve (20 1, 20 2) designed as a back-check valve and arranged in the partition wall, the compressed gas being discharged from the pump chamber into the outlet chamber via said outlet valve, the outlet valve (20 1, 20 2) being defined by a valve opening (19 1, 19 2) in the partition wall, a valve seat provided around the valve opening (19 1, 19 2), and a leaf spring (40 1, 40 2) as a valve body, wherein the leaf spring (40 1, 40 2) is movable between a closed position of the outlet valve (20 1, 20 2) in which the leaf spring (40 1, 40 2) rests on the valve seat, and an opened position of the outlet valve (20 1, 20 2) in which the leaf spring (40 1, 40 2) is spaced from the valve seat, wherein the leaf spring (40 1, 40 2) is defined by a spring body which comprises a fastening site where the spring body is fixed to the partition wall, and a spring-body-side stopper whose distance to the fastening site is larger than a distance between the fastening site and an opening edge of the valve opening (19 1, 19 2) that is closest to the fastening site, and characterized in that the stopper cooperates mechanically with the partition wall in such a manner that a rotation of the leaf spring (40 1, 40 2) within the plane of the valve seat is restricted. a pump chamber for compressive rotation of a pump rotor therein, an outlet chamber into which the compressed gas is discharged from the pump chamber, a partition wall separating the pump chamber from the outlet chamber, and at least one outlet valve (20 1, 20 2) designed as a back-check valve and arranged in the partition wall, the compressed gas being discharged from the pump chamber into the outlet chamber via said outlet valve, the outlet valve (20 1, 20 2) being defined by a valve opening (19 1, 19 2) in the partition wall, a valve seat provided around the valve opening (19 1, 19 2), and a leaf spring (40 1, 40 2) as a valve body, wherein the leaf spring (40 1, 40 2) is movable between a closed position of the outlet valve (20 1, 20 2) in which the leaf spring (40 1, 40 2) rests on the valve seat, and an opened position of the outlet valve (20 1, 20 2) in which the leaf spring (40 1, 40 2) is spaced from the valve seat, wherein the leaf spring (40 1, 40 2) is defined by a spring body which comprises a fastening site where the spring body is fixed to the partition wall, and a spring-body-side stopper whose distance to the fastening site is larger than a distance between the fastening site and an opening edge of the valve opening (19 1, 19 2) that is closest to the fastening site, and characterized in that the stopper cooperates mechanically with the partition wall in such a manner that a rotation of the leaf spring (40 1, 40 2) within the plane of the valve seat is restricted. the leaf spring (40 1, 40 2) is movable between a closed position of the outlet valve (20 1, 20 2) in which the leaf spring (40 1, 40 2) rests on the valve seat, and an opened position of the outlet valve (20 1, 20 2) in which the leaf spring (40 1, 40 2) is spaced from the valve seat, wherein the leaf spring (40 1, 40 2) is defined by a spring body which comprises a fastening site where the spring body is fixed to the partition wall, and a spring-body-side stopper whose distance to the fastening site is larger than a distance between the fastening site and an opening edge of the valve opening (19 1, 19 2) that is closest to the fastening site, and characterized in that the stopper cooperates mechanically with the partition wall in such a manner that a rotation of the leaf spring (40 1, 40 2) within the plane of the valve seat is restricted.