In order to respond to the strict demands for reduction of environmental impact on a global scale, a new sheet metal turbine housing has been developed to improve fuel efficiency performance and exhaust emission performance of a diesel vehicle. It contributes to significant improvement of diesel engine emission under real world operation. It can realize earlier light-off of catalyst compared to a conventional solid casting housing through less heat mass by its hollow structure using sheet metal. Thermal deformation at a turbine shaft carrier caused by replacing with sheet metal is minimized by a casting and sheet metal hybrid structure. Increase of turbine noise is measured by adopting a damping plate. As a result, performance of a sheet metal turbine housing can be improved against casting one with keeping same liability of it.