A multilayer sheet made of a polyglycolic acid resin which is constructed by the fusion/lamination of a biodegradable resin layer on a base sheet of vegetable origin, characterized in that the biodegradable resin layer comprises one or more layers involving at least one polyglycolic acid resin layer and the layer fused with the base sheet is made of a biodegradable resin having a melt viscosity of 10 to 5.0.times.10.sup.3 Pasec at a temperature of 240.degree. C. and a shear speed of 122 sec.sup.-1 and a melting point of 235.degree. C. or lower. Although the multilayer sheet has a lamination structure made of biodegradable materials with light environmental burden at disposal, it is excellent in oxygen-barrier properties and resistance to moisture transmission. Thus, it is appropriately usable as a food container material.