Provided is a quality-improving agent for a starch-containing food, which gelatinizes a starch-containing food so as to have an appropriate hardness and does not impair the favorable flavor of materials, and also provided is a starch-containing food with improved quality. The quality-improving agent for a starch-containing food of the invention contains amylase, carrageenan and calcium lactate, or amylase, xanthane gum and locust bean gum, wherein the content of the amylase is 100 to 600 U/g, the content of the carrageenan is 20 to 70 mass%, the content of the calcium lactate is 1 to 25 mass%, the content of the xanthane gum is 15 to 40 mass%, and the content of the locust bean gum is 8 to 25 mass%.本發明提供一種含澱粉食品用品質改良劑及經品質改良之含澱粉食品，該含澱粉食品用品質改良劑能將含澱粉食品以適當的硬度凝膠化，並且不會損害素材的良好風味。本發明的含澱粉食品用品質改良劑，含有澱粉酶、鹿角菜膠及乳酸鈣，或是含有澱粉酶、三仙膠及刺槐豆膠；該澱粉酶的含量為100～600 U/g，該鹿角菜膠的含量為20～70質量%，該乳酸鈣的含量為1～25質量%，該三仙膠的含量為15～40質量%，該刺槐豆膠的含量為8～25質量%。
