vided is a colon delivery system which enables the delivery of an active ingredient to the large intestine without losing the active ingredient in the stomach or the small intestine and can release the active ingredient in the large intestine rapidly. A colon delivery composition comprising a capsule that encapsulates a bacterium useful for the large intestine, alginic acid and a calcium salt therein, a chitosan-containing layer that covers the capsule, and an enteric-base-material-containing layer (i.e., a layer containing an enteric base material) that covers the chitosan-containing layer, wherein the mass of chitosan in the chitosan-containing layer is 0.5 to 8.0 mass% relative to the mass of the capsule.本發明係提供一種可使活性成分不致於胃或小腸中喪失而到達大腸，且可於大腸中使該活性成分迅速釋出的用於輸送至大腸之系統。本發明為一種用於輸送至大腸之組成物，其含有：內包大腸益生菌、海藻酸及鈣鹽之膠囊；被覆該膠囊之含幾丁聚糖層；與被覆該含幾丁聚糖層之含腸溶性基材層；該含幾丁聚糖層中之幾丁聚糖質量相對於該膠囊質量，為0.5質量%~8.0質量%。
