A refill container comprising one sheet of lamination body comprising a base material and a sealant layer, and a pouring nozzle seal portion, wherein: the lamination body is folded such that the sealant layer is arranged inward to form a bend portion, a surface lamination body, and a rear surface lamination body; a peripheral portion of the surface lamination body and the rear surface lamination body is sealed; the bend portion together with the surface lamination body, the rear surface lamination body, and the pouring nozzle seal portion forms a pouring nozzle for pouring a content when the sealing is detached; a tip of the pouring nozzle is sealed by a pouring-nozzle tip seal portion, the pouring-nozzle tip seal portion is detachable along an opening line to form a pouring opening; at the lower portion of the pouring-nozzle tip seal portion an opening tab divided by an opening cutting line provided at the pouring nozzle seal portion is formed; the opening line is a single virtual line starting from the opening cutting line, passing through the surface lamination body, the bend portion, and the rear surface lamination body, and returning to the opening cutting line; the opening line is formed so as to incline with respect to the bend portion; a tip portion of the opening cutting line is bent toward a direction which is parallel to the opening line; wherein by the function of the elasticity of the lamination body (2, 3) in the bent portion the cross-section of the pouring nozzle always has a swelled shape on the upper portion; on the opening line, an easily cutting processing which forms one half-cutting line parallel to the opening line is performed; characterized in that the half-cutting line is broken at a ridge line of the bend portion. the lamination body is folded such that the sealant layer is arranged inward to form a bend portion, a surface lamination body, and a rear surface lamination body; a peripheral portion of the surface lamination body and the rear surface lamination body is sealed; the bend portion together with the surface lamination body, the rear surface lamination body, and the pouring nozzle seal portion forms a pouring nozzle for pouring a content when the sealing is detached; a tip of the pouring nozzle is sealed by a pouring-nozzle tip seal portion, the pouring-nozzle tip seal portion is detachable along an opening line to form a pouring opening; at the lower portion of the pouring-nozzle tip seal portion an opening tab divided by an opening cutting line provided at the pouring nozzle seal portion is formed; the opening line is a single virtual line starting from the opening cutting line, passing through the surface lamination body, the bend portion, and the rear surface lamination body, and returning to the opening cutting line; the opening line is formed so as to incline with respect to the bend portion; a tip portion of the opening cutting line is bent toward a direction which is parallel to the opening line; wherein by the function of the elasticity of the lamination body (2, 3) in the bent portion the cross-section of the pouring nozzle always has a swelled shape on the upper portion; on the opening line, an easily cutting processing which forms one half-cutting line parallel to the opening line is performed; characterized in that the half-cutting line is broken at a ridge line of the bend portion.