To provide polyester blow moldings without a fear for a contamination of contents having a good transparency even after recovering and reusing, and reused without a flaw on the surface.

The polyester blow moldings are covered with the heat- shrinkable film by performing a heat treatment. The heat-shrinkable film is composed of a polyester from naphthalene dicarboxylic acid and/or terephthalic acid of 60-92.99 mol% isophthalic acid of 0.01-20 mol%, isophthalic acid substituted with metal sulfonate of 7-20 mol% to the total acid to components, and ethylene glycol of 65-95 mol% and diethylene glycol 5-35 mol% to the total diol.