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A variable geometry turbocharger in which a bill-like projection portion is arranged in a part of an outer periphery of a flow passage spacer, and the projection portion is protruded to a turbine rotor side at a predetermined angle or the projection portion is movably provided. Alternatively, a rod-

A variable geometry turbocharger in which a bill-like projection portion is arranged in a part of an outer periphery of a flow passage spacer, and the projection portion is protruded to a turbine rotor side at a predetermined angle or the projection portion is movably provided. Alternatively, a rod-like member is arranged in a part of an outer periphery of a flow passage spacer and the rod-like member is arranged so as to be adjacent to the turbine rotor side at a predetermined angle. Alternatively, a guide vane in which a leading edge side of a rotational shaft is eliminated is arranged in a part of an outer periphery of a flow passage spacer and the rotational shaft is arranged so as to be adjacent to the turbine rotor side at a predetermined angle. Further, a heat resisting cast steel having a little amount of carbon is employed as a material for a casing and a guide vane table sectioning the turbine chamber, and without using the flow passage spacer and in place of the flow passage spacer, both side walls sectioning the turbine chamber themselves keep a gap with respect to the guide vane minimum. Accordingly, a high turbine efficiency can be obtained by preventing a gas stream from being separated at the back of a flow passage spacer and inside a guide vane, since a hydraulic energy loss is reduced and a uniform and high average flow speed distribution is realized at a position of an inlet of a turbine rotor.

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A variable geometry turbocharger in which a bill-like projection portion is arranged in a part of an outer periphery of a flow passage spacer, and the projection portion is protruded to a turbine rotor side at a predetermined angle or the projection portion is movably provided. Alternatively, a rod-

A variable geometry turbocharger in which a bill-like projection portion is arranged in a part of an outer periphery of a flow passage spacer, and the projection portion is protruded to a turbine rotor side at a predetermined angle or the projection portion is movably provided. Alternatively, a rod-like member is arranged in a part of an outer periphery of a flow passage spacer and the rod-like member is arranged so as to be adjacent to the turbine rotor side at a predetermined angle. Alternatively, a guide vane in which a leading edge side of a rotational shaft is eliminated is arranged in a part of an outer periphery of a flow passage spacer and the rotational shaft is arranged so as to be adjacent to the turbine rotor side at a predetermined angle. Further, a heat resisting cast steel having a little amount of carbon is employed as a material for a casing and a guide vane table sectioning the turbine chamber, and without using the flow passage spacer and in place of the flow passage spacer, both side walls sectioning the turbine chamber themselves keep a gap with respect to the guide vane minimum. Accordingly, a high turbine efficiency can be obtained by preventing a gas stream from being separated at the back of a flow passage spacer and inside a guide vane, since a hydraulic energy loss is reduced and a uniform and high average flow speed distribution is realized at a position of an inlet of a turbine rotor.