A turbomachine comprising: a casing; a first airfoil disposed inside the casing such that a fluid passes the first airfoil while flowing through the casing; a first inner frame coupled to a radially inner end of the first airfoil; a first inner wing protruding from the first inner frame in an axial direction of the casing; a second airfoil disposed inside the casing and adjacent the first airfoil in a flow direction of the fluid; a second inner frame coupled to a radially inner end of the second airfoil and disposed adjacent to the first inner frame; a second inner wing protruding from the second inner frame in the axial direction of the casing and disposed adjacent to the first inner wing; wherein the first airfoil is coupled to an inner circumferential surface of the casing and configured to guide the fluid flowing through the casing to the second airfoil, and the second airfoil is disposed therein spaced apart in the radial direction from the inner circumferential surface of the casing and is rotated by the fluid flowing through the casing; and a plurality of rim seals (10, 20, 30, 40, 50) disposed between the first inner wing and the second inner wing, arranged at intervals along a circumferential direction of the casing, and configured such that cooling air present in a wheel space, which is disposed radially inwardly from the first and second inner wings (122, 132) in a radial direction, flows into the plurality of rim seals (10, 20) through ingress ports, passes each rim seal of the plurality of rim seals (10, 20), and flows out through egress ports, wherein a region on a downstream side of the first airfoil in the flow direction of the fluid flowing through the casing is divided into a first region (+) having a relatively high pressure and a second region (-) having a relatively low pressure, wherein a first flow passage and a second flow passage are provided between adjacent rim seals (11, 12, 13) of the plurality of rim seals (10, 20), characterised in that the first flow passage is configured such that a size in the circumferential direction increases from an ingress port to a respective egress port and the respective egress port communicates with the first region (+), and the second flow passage is configured such that a size in the circumferential direction decreases from an ingress port to a respective egress port and said respective egress port communicates with the second region (-). a casing; a first airfoil disposed inside the casing such that a fluid passes the first airfoil while flowing through the casing; a first inner frame coupled to a radially inner end of the first airfoil; a first inner wing protruding from the first inner frame in an axial direction of the casing; a second airfoil disposed inside the casing and adjacent the first airfoil in a flow direction of the fluid; a second inner frame coupled to a radially inner end of the second airfoil and disposed adjacent to the first inner frame; a second inner wing protruding from the second inner frame in the axial direction of the casing and disposed adjacent to the first inner wing; wherein the first airfoil is coupled to an inner circumferential surface of the casing and configured to guide the fluid flowing through the casing to the second airfoil, and the second airfoil is disposed therein spaced apart in the radial direction from the inner circumferential surface of the casing and is rotated by the fluid flowing through the casing; and a plurality of rim seals (10, 20, 30, 40, 50) disposed between the first inner wing and the second inner wing, arranged at intervals along a circumferential direction of the casing, and configured such that cooling air present in a wheel space, which is disposed radially inwardly from the first and second inner wings (122, 132) in a radial direction, flows into the plurality of rim seals (10, 20) through ingress ports, passes each rim seal of the plurality of rim seals (10, 20), and flows out through egress ports, wherein a region on a downstream side of the first airfoil in the flow direction of the fluid flowing through the casing is divided into a first region (+) having a relatively high pressure and a second region (-) having a relatively low pressure, wherein a first flow passage and a second flow passage are provided between adjacent rim seals (11, 12, 13) of the plurality of rim seals (10, 20), characterised in that the first flow passage is configured such that a size in the circumferential direction increases from an ingress port to a respective egress port and the respective egress port communicates with the first region (+), and the second flow passage is configured such that a size in the circumferential direction decreases from an ingress port to a respective egress port and said respective egress port communicates with the second region (-).