Scroll housing and turbocharger

摘要

PROBLEM TO BE SOLVED: To provide a scroll housing for a turbine that can smoothly switch an air supply mode of an engine in an engine system including two superchargers.SOLUTION: The scroll housing includes: a first flow passage 12 that supplies fluid to a housing space for housing a turbine impeller; and a second flow passage 13 that is provided parallel to the first flow passage 12 and connected to the housing space. A flow passage end opening 12a of the first flow passage 12 is disposed adjacent to a flow passage end opening 13a of the second flow passage 13 in the same direction.