To provide an antiseptics, a detergent, an antimicrobial, a deodorizer against nitrogenous odor, an insecticide, a repellent and a bactericide, containing an ozonized surfactant obtained by adding ozone to a surfactant having at least one olefin-based double bond in a hydrophobic group moiety. These are highly safe to the human body and have features and performance that ordinary surfactants do not have.