To provide a method of manufacturing an impeller with a shroud that facilitates a cutting process for a blade (that is, passage processing), and that allows the diffused junction.

This method of manufacturing an impeller with a shroud includes a process step of splitting an impeller with a shroud into a member 5 on the outer diameter side and another member 6 on the inner diameter side and processing each member 5 and 6 into a predetermined shape respectively, and a junction step of diffusion-joining the members after the processing.