These days American private security industries has rapidly grown, and its scales(employment, expenditures) exceed the public police. American private security are based on the theories such as privatization, co-production, and build more developmental framework. But the behind of private security, its civil and criminal liabilities are more issued. In this, among the civil liabilities focused on the tort liability. In civil liabilities, contract liability is specially raised by between contractors, on the other hand tort liability is raised in general without special relationship in civil law relations. In this study, I would observe the types, conditions, protest reasons and the cases in tort generated by private security officials.