This aims to provide a vacuum capacitor comprising at least one conducting member constituting a hollow housing formed in the conducting member and a communicating hole for providing communication between the housing and a vacuum chamber. In the housing, there is arranged a getter, by which an object to be adsorbed, such as metal grains or a gas in the vacuum chamber is adsorbed. Since no electric field is applied to the getter, the getter does not reach a re-emission temperature, and an electron-stimulated-desoprtion phenomenon is not caused, even if an electric field is generated in the vacuum chamber, so that the metal grains, gas or the like, once adsorbed by the getter, can be prevented from being emitted.