The invention provides a high intermediate pressure turbine. The rotor (10) of the high intermediate pressure turbine (T1) comprises a plurality of rotor members (20, 30, 40) joined to each other in an axial direction in which an axis (P) extends, and among the plurality of rotor members (20, 30, 40), a first rotor member (30) in a working fluid introduction part (3a, 3b) of a flow path (3) is produced from a Ni base alloy and has a hollow interior over the entire length thereof in the axial direction.