<p>A labyrinth seal is provided that can suppress the occurrence of an unequal pressure pattern in the seal, suppress unstable vibration of a rotating shaft and ensure sealing performance. The labyrinth seal includes a seal ring 13 and a plurality of seal fins 11. Ring-like cavities 12 are defined on the outer circumference of the rotating shaft 2 with the seal ring 13 and the seal fins 11. The ring-like cavities 12 suppress a leakage flow LS moving along the outer circumference of the rotating shaft 2. Void portions 14 are each provided on the outer circumferential side of the cavity 12 in the seal ring 13 so as to extend in the circumferential direction of the rotating shaft 2 and communicate with the cavity 12 at circumferential intervals to temporarily relieve a leakage flow from inside the cavity in the circumferential direction.</p>
