The object of the present invention is to provide a method for manufacturing solid milk having suitable hardness for practical use by manufacturing powdered milk having good compaction moldability. In the manufacturing method of solid milk of the present invention, powdered milk for manufacturing solid milk is produced (S100), and then solid milk is produced by produced powdered milk. This manufacturing process (S100) comprises a gas dispersal process (S112) and a spray drying process (S114). In the gas dispersal process (S112), a prescribed gas is dispersed into liquid milk which is an ingredient of the powdered milk. In the spray drying process (S114), the liquid milk having a dispersed prescribed gas is sprayed, and the sprayed liquid milk is dried. By performing these processes, powdered milk is obtained. Solid milk is manufactured by solidifying the powdered milk.