Using Cacao husk, a by-product of chocolate production, as a substitute for sawdust in Hericium erinaceum cultivation was investigated. 1 By replacing sawdust with Cacao husks, a substitution ratio of 25% or less is useful as a substrate. 2 It was analyzed, the proximate composition ; total dietary fiber, minerals, free monosaccharide, free disaccharide and free sugar alcohol in fruit body cultivated in the substrate substituted at 0, 50 and to 100%. The proximate composition, total dietary fiber and mineral content showed the same readings regardless of all the substrates. The total monosaccharide and total disaccharide content became higher as the substitutive ratio of cacao husk increased. On the other hand, the total sugar alcohol content decreased.