PURPOSE: To obtain a hollow molded article having uniform thickness and suitable as a beer container, etc., by using a branched polyester obtained by copolymerizing a specific amount of a polyfunctional hydroxy compound to a polyester composed of terephthalic acid, isophthalic acid and ethylene glycol.

CONSTITUTION: The objective molded article is obtained by using a material comprising the branched polyester composed of (A) a dicarboxylic acid component composed of 80W95mol% (based on the dicarboxylic acid component) of terephthalic acid and 20W5mol% of isophthalic acid, (B) a glycol component composed mainly of ethylene glycol (preferably containing 90W100% of ethylene glycol and remaining part of propylene glycol, bisphenol A, etc.) and (C) 0.05W 1.0pt.mol, based on 100pts.mol of the component A, of a polyfunctional hydroxy compound having ≥3 OH groups.