To provide an antiallergic composition comprising extracted liquid or extracted essence from genus Citrullus vegetables as an active component, in relation to the extract of genus Citrullus vegetables, and to provide a new chemical compound contained in the extracted liquid.

The antiallergic composition comprises the extracted liquid or extracted essence as the active component which is obtained by extracting the vegetables of genus Citrullus by a lower aliphatic alcohol or its hydrate.