A vacuum pump, comprising: a casing provided with an inlet port and an outlet port; a stator portion provided inside the casing; a rotor portion having a shaft rotatably supported inside the casing, and a rotor disposed on the shaft and provided with a gas transfer mechanism that transfers a gas from the inlet port to the outlet port, the rotor portion being arranged with a predetermined clearance between the rotor portion and the stator portion; a motor rotating the shaft; electromagnets (8b, 12b, 20a, 20b) supporting the shaft; displacement sensors (9b, 13b, 17b) detecting displacement of the shaft; characterized on that the pump comprises: contact detection means (100, 102, 48), comprising vibration detection means for detecting vibration, wherein the vibration detection means is configured of a vibration sensor disposed in the stator portion, on a member that opposes the rotor portion and is configured to detect an occurrence of contact between the stator portion and the rotor portion when, in the vibration detected by the vibration detection means, a specific vibration caused by contact between the stator portion and the rotor portion exceeds a predetermined threshold value; and alarm output means configured to emit an alarm when the contact detection means detects occurrence of contact between the stator portion and the rotor portion, wherein the timing when the alarm output means emits an alarm is in any one of the case when: the time interval at which the vibration caused by the contact is detected shrinks over time and becomes shorter than a predetermined interval time; the case when the revolutions at which contact is detected exceeds predetermined revolutions; or the case when an integrated value of the time over which contact is detected exceeds a predetermined time. a casing provided with an inlet port and an outlet port; a stator portion provided inside the casing; a rotor portion having a shaft rotatably supported inside the casing, and a rotor disposed on the shaft and provided with a gas transfer mechanism that transfers a gas from the inlet port to the outlet port, the rotor portion being arranged with a predetermined clearance between the rotor portion and the stator portion; a motor rotating the shaft; electromagnets (8b, 12b, 20a, 20b) supporting the shaft; displacement sensors (9b, 13b, 17b) detecting displacement of the shaft; characterized on that the pump comprises: contact detection means (100, 102, 48), comprising vibration detection means for detecting vibration, wherein the vibration detection means is configured of a vibration sensor disposed in the stator portion, on a member that opposes the rotor portion and is configured to detect an occurrence of contact between the stator portion and the rotor portion when, in the vibration detected by the vibration detection means, a specific vibration caused by contact between the stator portion and the rotor portion exceeds a predetermined threshold value; and alarm output means configured to emit an alarm when the contact detection means detects occurrence of contact between the stator portion and the rotor portion, wherein the timing when the alarm output means emits an alarm is in any one of the case when: the time interval at which the vibration caused by the contact is detected shrinks over time and becomes shorter than a predetermined interval time; the case when the revolutions at which contact is detected exceeds predetermined revolutions; or the case when an integrated value of the time over which contact is detected exceeds a predetermined time. contact detection means (100, 102, 48), comprising vibration detection means for detecting vibration, wherein the vibration detection means is configured of a vibration sensor disposed in the stator portion, on a member that opposes the rotor portion and is configured to detect an occurrence of contact between the stator portion and the rotor portion when, in the vibration detected by the vibration detection means, a specific vibration caused by contact between the stator portion and the rotor portion exceeds a predetermined threshold value; and alarm output means configured to emit an alarm when the contact detection means detects occurrence of contact between the stator portion and the rotor portion, wherein the timing when the alarm output means emits an alarm is in any one of the case when: the time interval at which the vibration caused by the contact is detected shrinks over time and becomes shorter than a predetermined interval time; the case when the revolutions at which contact is detected exceeds predetermined revolutions; or the case when an integrated value of the time over which contact is detected exceeds a predetermined time. the time interval at which the vibration caused by the contact is detected shrinks over time and becomes shorter than a predetermined interval time; the case when the revolutions at which contact is detected exceeds predetermined revolutions; or the case when an integrated value of the time over which contact is detected exceeds a predetermined time.