PURPOSE: To precisely form a turbine housing so that a partition in the turbine housing can approach a turbine rotor and to facilitate manufacture thereof, by a method wherein, the turbine housing is cast, a forward end member is previously attached to the partition of the core of a matrix.

CONSTITUTION: A core N, conforming to the internal configuration of a turbine housing 18, is formed. In manufacture of the core N, a forward end member 20a, precisely formed, is buried in the central part of the core N, and the outer peripheral part of the forward end member 20a is slightly exposed. Thereafter, a molten metal is poured in a matrix employing the core to cast the turbine housing 18, and after cooling, the core N is removed.