An article storage case is capable of highly reliable coupling to another such article storage case by simply placing the cases side by side. An article storage case according to the invention is in a substantially cubic or rectangular parallelepiped form having an opening oriented upwardly and has an arrangement in which a sidewall thereof has an outside surface formed with an engagement projection and an engagement recess, and in which when a plurality of such article storage cases are placed side by side, the engagement projection of one of adjacent article storage cases is capable of being movably fitted into the engagement recess of another one of the adjacent article storage cases to couple the adjacent storage cases to each other by engagement between the engagement projection and the engagement recess which are movably fitted with each other.