The object of the present invention is to improve flavor of microwave cooking chicken and to provide a flavor-improved microwave cooking chicken.The solution means of the present invention is a composition for improving flavor of microwave cooking chicken comprising a roast flavoring agent and a subsidiary material in which the subsidiary material comprises one or two or more selected from saccharide, glutamine and spices and it comprises at least a saccharide. The composition is used for improving flavor of microwave cooking chicken. A method for improving flavor of microwave cooking chicken comprises contacting a chicken with the said composition and cooking the contacted chicken by a microwave oven. A method for producing a flavor-improved microwave cooking chicken comprises contacting the said chicken with the said composition and cooking the contacted chicken by a microwave oven.本發明之課題在於改善微波爐調理雞肉之風味及提供風味改善之微波爐調理雞肉。本發明之解決手段為一種用於改善微波爐調理雞肉風味之組成物,其具有燒烤風味調味料和副食材,該副食材係選自糖類、麩胺酸及辛香料中的1種或2種以上且至少包含糖類;該組成物係用以改善微波爐調理雞肉之風味;一種微波爐調理雞肉之風味改善方法,其包含使該組成物接觸雞肉及將經組成物接觸的雞肉進行微波爐調理;以及一種風味改善之微波爐調理雞肉之製造方法,其包含使該組成物接觸雞肉及將經組成物接觸的雞肉進行微波爐調理。