Disclosed is a vacuum pump which can reduce noise and vibrations without an increase in size, and which can maintain heat dissipation properties while the size of the casing is reduced. In order to do so, at least one folding section is provided in an exhaust channel formed in a casing main body. Also, the casing main body is formed from a material having a higher thermal conductivity than a rotor and a vane, and a cylinder unit, in which the vane slides, is press fitted into the casing main body.