To provide a motor which inhibits demagnetization of magnets and reduces emission of an impurity gas in an environmental atmosphere used.

A motor includes: a motor stator 30; a housing 20; a motor rotor 40; a bearing device 14; a hermetically sealing member 60; and an accumulation part 45. The motor stator 30 includes an excitation coil 32 and a stator core 31. The hermetically sealing member 60 seals a gas of a space 39, where the motor stator 30 is disposed, so as to prevent the gas from flowing into spaces 48, 49 where the motor rotor 40 is disposed. The accumulation part 45 accumulates a liquid medium 46, covering at least a part of magnets 42, in an area between the housing 20 and the hermetically sealing member 60.