To provide a foamed sheet of a thermoplastic resin, having excellent extrusion characteristics at production of the foamed sheet, also having excellent rigidity, modulus, heat insulation, cold resistance, cushioning characteristics and the like, and capable of being secondarily processed to various kinds of containers or the like; and to provide a method for producing the container having excellent heat resistance.

The foamed sheet is obtained by using a resin composition as a raw material, obtained by compounding (D) a compatibilizer of 1-20 pts.wt. with the total of 100 pts.wt. of three components consisting of (A) a polylactic acid of 20-90 wt.%, (B) a polystyrene-based resin of 5-65 wt.% and (C) a polypropylene-based resin of 5-40 wt.%, and has 1.1-5.0 expansion ratio and 0.5-3.0 mm thickness. The method for producing the container having the excellent heat resistance involves producing the container under a specific condition.

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