PURPOSE: To prevent a gate board from being dislocated inward during use by providing a projection on the bottom side of the gate board, a stopper for the projection which stops the gate board from being dislocated inward by being placed so as to be in contact with the inner side of the projection above the bottom board, and a long bearing hole formed either in a frame body placed above or in the gate board.

CONSTITUTION: From the lower part of a gate board 5 a bottom part 52 projects horizontally in the form of the letter L. A projection 53 is formed on the bottom side of the bottom part 52 in parallel with the longitudinal side of the bottom part 52 and in solid continuation therefrom. A stopper 33 which projects on the inner side of the projection 53 and touches it is provided in parallel with an erect wall 32 raised from the bottom board 3 and in solid continuation from the bottom board 3. When the collapsible container is put together with the gate board 5 fastened in place, an oblong hole 91 which a bearing 9 provided in an upper frame 2 above the gate board 5 has and a shaft 8 are made to leave therebetween under the shaft 8 a gap L which is approximately equal to the measurement (h) of the projection 53 as compared in terms of height from the lowest point. As a result, the container can be put together ands folded up in a simple manner and the gate board 5 is prevented from being dislocated inward during use.