To contain an inner container having various shapes, by containing the inner container so as to freely put it in an outer container or put it out of the outer container provided with a liquid-inflow opening, a pressurizing opening plug and the like, and supporting the inner container through a fixing tool constituted of a receiving body supporting the bottom and the outside face thereof and a contact body coming in touch with the inside wall face of the outer container.

An outer container 1 provided with a liquid-inflow opening plug, a pressurizing opening plug, a safety valve, etc., is constituted of a body 6 and a cove body 5 hermetically closing the opening or releasing it. And an inner container 11 such as a high density synthetic resin blow-molded container or the like processed with a treatment resistant to chemicals is contained therein so as to freely put it therein or out thereof. When containing the inner container 11, a fixing tool 12 thereof is contained in the outer container 1 to support the inner container 11 by a fixing tool 12. That is, the bottom face 11a of the inner container 11 is supported by a receiving body 13 made of a plate provided with a hole 13a at the center of the fixing tool 12, the outside face 11b is supported by a receiving body 14, and a contact body 15 formed in the receiving body 14 is arrange to contact the inside wall face 1a of the outer container 1. In this way, the inner container 11 can be stably held in the outer container 1.