The present invention relates to a puffed cereal containing a seaweed, which is made by adding a seaweed to partially gelatinized rice, and has soft texture and improved preference, and to a method for manufacturing the same. The puffed cereal containing a seaweed has softer texture compared with a product having only rice puffed, does not contain saturated fat, trans fat, and cholesterol, and is able to be used as diet foods, health foods, convenience foods, and functional foods by having low calories.본 발명은 부분호화시킨 쌀에 해조류를 첨가하여 팽화시킴으로써, 부드러운 식감과 기호도를 향상시킨 해조류 첨가 곡류 팽화물 및 이의 제조방법에 관한 것으로, 쌀만을 팽화시킨 팽화물에 비하여 식감이 부드러워지고, 포화지방, 트랜스지방 및 콜레스테롤을 함유하지 않으며, 낮은 칼로리를 가져 다이어트식, 건강식, 편의식, 기능식으로 이용이 가능하다.