A new orsellinic acid derivative, orsellide A(1), together with orsellide A, orsellide D, and orsellinic acid, was isolated from the ethyl acetate extract of the solid-state fermented rice culture of the Chaetomium megalocarpum cib-135 fungus. The structure of orsellide A(1) (1) was confirmed to be 2-O-(2,4-dihydroxy-6-methylbenzoyl)-6-deoxy-1-O-ethyl-3-keto-alpha-D-ribo-hexopyranoside on the basis of spectroscopic analysis.