As the production of chestnuts from chestnut trees has been increased annually in the past several years in this country, developing the utilities of chestnut bur has been considered as one of main research problems. Therefore. in this paper, the chemical components were analysed to find a way of utilizing the chestnut bur. It was proved that chestnut bur is abundant in extractives (hot water 16.0%, 1%-NaOH 40.6%) and tannin content (16.5%). Of the tannin, the soluble tannin (3.2%) content is higher than condensed tannin (2.2%), and gallic acid content(3.3-3.9%) is slightly higher than ellagic acid(2.8-3.0%), For more effectively utilizing as a tannin resources, the chestnut bur should be collected immediately after yield of chestnuts, maybe in October every year.