To provide a dividable cardboard-tray which can be produced of a small amount of material.

In a fold-in member 5 continuing to the edge of the upper end of each of side plates 2 erected from the edges of the sides of a bottom wall 1, a large fold-in plate 11 and a small fold-in plate 12, which are situated along the internal face of the side plate 2, and a partition plate 13, which is situated below the small fold-in plate 12 and connected with the inside edge of the large fold-in plate 11 are formed. A partition wall 31 is formed by opposing the large fold-in plates 11 and small fold-in plates 12 of facing side walls 30 and by superimposing the partition plates 13 of the fold-in members 5. And a sandwich strip 14 extending out from the edge of the leading end of each partition plate 13 is sandwiched between the corresponding side plate 2 and small fold-in plate 12, and a dividing cut line connecting boundaries between the large fold-in plates 11 and small fold-in plates 12 is made from the bottom wall 1 all the way to both the side plates 2. Because the partition wall 31 is formed of parts of the fold-in members 5, the tray can be produced of the small amount of material.