PURPOSE: To couple two or more containers together when they are carried by a carriage device and separate them when they are manually carried, by providing couplers on the sides and tops of the containers to couple them to adjacent ones, and stoppers to keep coupled state.

CONSTITUTION: Container main bodies 1 and 2 are equipped with couplers 1D and 2D at corresponding positions, and the coupler 2D has L shape stopper protrusions 2E which are inserted into connection holes 1E and gotten down so that the coupler 2D is connected to the coupler 1D. A hanger connection slots 1F are provided on the upper part of the container main body 1 and a hanger 1A has support pins 1G which are inserted into the hanger connection slots 1F from inside the container main body 1 to hold the hanger 1A free to rotate. The stopper protrusions 2E are inserted into the connection holes 1E of the coupler 1D and gotten down to attain coupled state, and the hanger 1A moves to the right so that the hanger 1A holds the stopper protrusion 2E located at the uppermost position and plays a role of a stopper.