To provide a tool storage bag and a tool storage bag set capable of restraining manufacturing cost, and superior in versatility.

In this tool storage bag 20, inner trays 1 and 10 formed in a bottomed box shape of opening an upper surface for storing a power tool, are arranged inside. The inner trays 1 and 10 are formed of a cloth member. The inner trays are detachably arranged inside by supporting an outer surface of the inner trays by an inner surface of the tool storage bag, or by a positioning means arranged between the inner surface 23 of the tool storage bag and the outer surfaces of the inner trays 1 and 10.