PURPOSE: To provide a novel perfumery composition containing 2- ethylidene-1,4-5,8-dimethano-1,2,3,4,4a,5,8,8a-octahydronaphthalene and useful for imparting excellent fragrance to perfume, cosmetic, aromatic, bathing agent, etc.

CONSTITUTION: The objective composition contains 2-ethylidene-1,4-5,8- dimethano-1,2,3,4,4a,5,8,8a-octahydronaphthalene of formula as an essential compo nent. The compound can be produced by using ethylidenenorbornene as a start ing raw material and reacting the material with cyclopentadiene. The compound has a highly diffusible fragrance of fresh floral woody note accompanying grapefruit-like citrus note and woody note suggesting vetiver.