PURPOSE: To obtain seasoned dried fish capable of providing flakes of dried fish having strong flavor and capable of efficiently preparing stock and suitable for dried bonito, etc., by putting dried fish under reduced pressure close to vacuum, immersing the dried fish in a seasoned liquid in a state of reduced pressure and pressurizing the dried fish in immersed state.

CONSTITUTION: For example, dried fish such as dried mackerel is put in a pressure kettle 2 and the pressure in the kettle 2 is reduced to a reduced pressure closed to vacuum and a seasoning liquid is introduced into whole the pressure kettle 2 while holding a state where pressure is reduced and the dried fish is immersed in the seasoning. Liquid pressure of the seasoning is pressurized by a pressurizing pump 7 in a state where the dried fish is immersed and this pressurized state is kept for a prescribed time and the seasoning liquid is permeated into the interior of the dried fish and the pressure in the interior of the pressure kettle 2 is released and the dried fish is taken out and the liquid is removed to provide the objective seasoned dried fish.