To provide an inclusion carrier composed of water-soluble polysaccharides imparting high hydrophilicity and modifying inclusion ability while utilizing advantages essential to the polysaccharides such as slight adverse effects on environments or human bodies.

The inclusion carrier is characterized in that the carrier is composed of the water-soluble polysaccharides in which a carboxy group or various salts of the carboxy group are introduced by selectively oxidizing primary hydroxy groups of a monosaccharide constituting the polysaccharides. The primary hydroxy groups of the polysaccharide can selectively be oxidized in the presence of an N-oxyl compound with a co-oxidizing agent by dispersing or dissolving the polysaccharides in an aqueous system. The inclusion composite obtained by including an active component such as a food, a cosmetic, a medicine, ink or an agrochemical in an inclusion carrier is utilized in the fields of the food, the cosmetic, the medicine, the ink, the agrochemical, etc.