The present invention provides coffee that does not undergo deterioration in freshness for a long period of time, and that, without fail, has rich tastiness and aroma superior to that in a specialty store even in a beverage venue other than a specialty store and particularly for typical habitual coffee drinkers. A coffee bean storage bag (1) comprises: a water-permeable inner bag (3) in which coffee beans (4) that are roasted and are supplied for drinking once are sealed; and an air-tight light-blocking outer bag (2) in which the inner bag (3) is stored in an airtight state, the outer bag (2) being filled with an inert gas. In the inner bag (3), two end surfaces are opened to form an opening (3e), and the coffee beans (4) are charged from the inlet of a coffee mill via the opening (3e). The empty inner bag (3) is connected to the coffee powder discharge port of the coffee mill to recover a coffee powder.