this invention relates to the method for manufacturing a variety of square bottom containers by folding to the same side both of two brims of a sheet - shaped container of raw material of paper , aluminum foil , plastic laminate film and the like such that the brims mutually abut each other , forming a bonding agent or heat - seal layer on the outsides of both these butted brims , then forming the lower portion into a w - shape with an inverted v - shaped fold being provide in the midway , and then press - fitting the bonding agent or heat - seal layer from the outside of the formed sheet for its bonding or deposition , the press fit formed sheet defining a square bottom container having a bottom laminate which is flat with no overlap and having a heat seal film or the like which doesn &# 39 ; t come inside the container . the method is efficient and the containers can be manufactured quite easily .