To provide a liquid sealing type vacuum pump capable of being used even at high rotation speed and low rotation speed and being miniaturized.

In a movable vane type vacuum pump using conventional sealing liquid, a clearance A is formed at whole periphery between an outer end face 11 of a vane 10 and an inner wall 15 of a casing 1. A vane chamber 17 having a clearance B at a dead point D is formed between an outer wall 16 of a rotor 3 and the inner wall 15 of the casing 1, and a suction port 18 and a discharge port 18 are provided in either of a front end plate and a rear end plate 6.