A mechanical seal (100) includes: a rotating ring (110); a stationary ring (120); a floating ring having an annular sliding portion (131) in which a sliding surface (131a) slides on the rotating ring (120), and a pressed portion (132) in which a pressed surface (132a) makes contact with the stationary ring (120), the floating ring sealing a sealed fluid via the sliding surface (131a) of the sliding portion (131) and the pressed surface (132a) of the pressed portion (132), wherein in the floating ring (130), a size of an area of an end surface in the axial direction on a fluid side L which is a surface that receives fluid pressure of the sealed fluid in a direction toward a side of the rotating ring (110), and a size of an area of an end surface in the axial direction on the fluid side L differ from each other.

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