Objective: In recent years Iranian Social Security Organization has developed its protection level to more labor force population and accepted more responsibilities. Because of these more responsibilities, more costs have been charged to this organization. At this article short run protection costs related to such responsibilities for the above mentioned organization are investigated. Method: For this purpose, cost function for short run protections with the help of literatures for multi - product firms and using Panel Data in econometrics methods for all Iran's provinces have been estimated. Findings and Results: Results show that short run protections has most sensitivity by quantity of unemployment insurance users.