A degasification system comprising: a plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) configured to degasify a liquid; a cylindrical housing configured to house the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) in parallel: and a suction pipe communicating with an inside of hollow fiber membranes and penetrating the housing to suction the inside of the hollow fiber membranes, wherein each of the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) includes a hollow fiber membrane bundle in which the plurality of hollow fiber membranes are bundled in a cylindrical shape and a cylinder in which the hollow fiber membrane bundle is housed, wherein the housing has an inlet through which the liquid is supplied from outside, an outlet through which the liquid is discharged to the outside, and a sealing portion which partitions an internal space of the housing into an upstream side region on the inlet side and a downstream side region on the outlet side via the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D), wherein the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) are arranged in parallel so that the liquid is supplied in parallel from the inlet, wherein the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) are configured such that pressure losses of the liquid differ depending on a distance from a central axis of the housing, so that a deviation of a flow rate of a liquid flowing through the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) is reduced, and wherein the pressure loss of the liquid flowing through the degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) increases the closer the degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) are to the central axis of the housing. a plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) configured to degasify a liquid; a cylindrical housing configured to house the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) in parallel: and a suction pipe communicating with an inside of hollow fiber membranes and penetrating the housing to suction the inside of the hollow fiber membranes, wherein each of the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) includes a hollow fiber membrane bundle in which the plurality of hollow fiber membranes are bundled in a cylindrical shape and a cylinder in which the hollow fiber membrane bundle is housed, wherein the housing has an inlet through which the liquid is supplied from outside, an outlet through which the liquid is discharged to the outside, and a sealing portion which partitions an internal space of the housing into an upstream side region on the inlet side and a downstream side region on the outlet side via the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D), wherein the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) are arranged in parallel so that the liquid is supplied in parallel from the inlet, wherein the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) are configured such that pressure losses of the liquid differ depending on a distance from a central axis of the housing, so that a deviation of a flow rate of a liquid flowing through the plurality of degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) is reduced, and wherein the pressure loss of the liquid flowing through the degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) increases the closer the degasification units (2, 2A, 2B, 2C, 2D, 22, 22A, 22B, 22C, 22D) are to the central axis of the housing.