Vacuum pump

A vacuum pump, comprising:

• a flow path of a gas from an inlet port to an outlet port;
• and
• a deposited material sensor that is arranged, in the flow path, on an upstream side or a downstream side of a predetermined flow path position where a cause of disruption to operation of the vacuum pump is to occur, wherein
• the deposited material sensor is configured to detect a presence or absence of deposited material at an arrangement position of the deposited material sensor without being configured to detect a thickness of the deposited material at the arrangement position, and
• the arrangement position of the deposited material sensor is a position where a thickness of the deposited material at the predetermined flow path position assumes a predetermined thickness that corresponds to a maintenance time of maintenance for suppressing the cause when a detection state of the deposited material sensor changes from deposited material absent to deposited material present.