The invention relates to a vacuum pump for generating a negative pressure, comprising a pump chamber (14, 15) having an inlet (143) and an outlet (150), wherein the outlet (150) is fitted with a valve (3). According to the invention the pump chamber (14, 15) is provided with a pressure sensor (23, 23', 24). Said vacuum pump has a relatively accurate and inexpensive vacuum sensor. It is additionally advantageous that the sensor, being integrated in the pump chamber, is largely unsusceptible to interference and requires little space.
