A rotating machine includes: a casing, a rotary shaft rotatably supported in the casing and extending in a thrust direction, a first magnet installed on the rotary shaft, an attenuation mechanism supported by the casing and disposed to face the first magnet in the thrust direction, a second magnet installed in the attenuation mechanism to face the first magnet in the thrust direction and that repels the first magnet, an impeller installed on one end of the rotary shaft, and support sections that support the attenuation mechanism with respect to the casing. Furthermore, the attenuation mechanism includes: an attenuator that attenuates vibrations of the second magnet in the thrust direction, and a pushing-back unit that pushes the second magnet back toward the first magnet.