of the sleeve that is exposed to a gas passage is comparatively small and thus the flow turbulence of the exhaust gas can be suppressed and the performance degradation of the turbine can be prevented in the preferred embodiment the sleeve member 12 is formed into a flange shape at each end portion thereof such that said each end portion of the sleeve member becomes thinner toward an outer circumference of the end portion that is the outer circumferential side of the flange has higher elasticity and thus the distribution of the pressure between the sleeve member 12 and each of the nozzle mount 7 and the nozzle plate becomes closer to even as a result it is possible to prevent strong impact near the outer circumference edge of the flange and plastic deformation thereof due to the impact it is preferable that the sleeve member 12 is made of a material which has a lower rigidity than the nozzle mount 7 the nozzle plate and the fastening bolt b with this configuration the sleeve member 12 deforms before the nozzle mount 7 and the nozzle plate 7 which leads to reduction of the contact pressure between the sleeve member 12 and each of the nozzle mount 7 and the nozzle plate 8 as a result it is possible to further suppressing reduction in the space between the end surfaces of the nozzle and the nozzle plate surface more specifically as a material selection of the fastening bolt b and the sleeve member 12 the fastening bolt b may be ni based heat resistant alloy or precipitation hardening.