To provide a casting method in which a cantilever blade is produced by a lost wax process using a tree-shaped wax model and the finishing work is easily applied.

In the method for casting the cantilever blade having an integrated blade at the shaft part and its tip end by the lost wax process using the tree-shaped wax model, the tree-shaped wax model in which the base end of a shaft part of the product is joined to the tip end of a runner section radially extended from the trunk section, is used to cast molten metal from the base end of the shaft part of the product, through the runner section from the trunk of a shell-like mold manufactured from the tree-shaped wax model.