From the fruits of Celastrus orbiculatus Thunb. a new β-dihydroagarofuran sesquiterpene ester named 1β,2β,13-triacetoxy-9α-cinnamoyloxy-β-dihydroagarofuran (1) has been isolated along with two known compounds, 6α-acetoxy-1β,9β-dibenzoyloxy-8β-hydroxy-β-dihydroagarofuran (2), and 1β, 6α-diacetoxy-9β-benzoyloxy-8β-hydroxy-β-dihydroagarofuran (3). Their structures were elucidated on the basis of spectroscopic data.