PURPOSE:To provide a polyester-polyester block copolymer composition which has a high melt viscosity, causes no reduction in melt viscosity during melting, can be molded stably and is excellent in impact resistance. CONSTITUTION:A polyester-polyester block copolymer composition comprising 100 pts.wt. polyester-polyester block copolymer which comprises a crystalline aromatic polyester as hard segments and a polylactone as soft segments, 0.01-10 pts.wt. epoxy compound having one or more functional groups, and 0.005-l pt.wt. pentavalent phosphorus compound.
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