Disclosed is a shaft sealing device (100) including: a housing (60) in which an annular recessed portion (61) is formed and which is fixed to a stator; a sealing body (20), a radially outer portion of which is accommodated by the annular recessed portion (61); and a high pressure-side sealing plate (40) that is disposed along the sealing body (20) in a high pressure region (Hs). An inflow groove (66) is formed in any member of the housing (60), the high pressure-side sealing plate (40), and the sealing body (20) such that a fluid flows through the sealing body (20) from a low pressure region (Ls) during a non-normal operation in which pressure in the high pressure region (Ls) is higher than pressure in the high pressure region (Hs). A communication path (69) is formed in the housing (60) such that the inflow groove (66) and a space in the high pressure region (Hs) communicate with each other via the communication path (69).