To provide a one-way container which can be folded compactly in an empty state, reduce the storage space and the transportation cost, and is easy of handling of transportation and storing or the like of a processed food or the like.

In the one-way container 1 provided with a closing mechanism 17a, 17b, 24a and 24b, and a cutting mechanism 13 and 13a to open it, a container body 2 is composed of a frame member 4 made of a synthetic resin and a bag body 5 made of a synthetic resin sheet mounted integrally on the frame member 4 by fusion bond or adhesion bond and an outer shell member 6 which is mounted on the frame member 4 by an engagement.