Air compressor has earned a fair amount of popularity amongst various industries due to diverse uses of compressor air in applications such as driving of air engines(air motors), operation of blast furnace, Bessemer conveyors, supercharging of I.C. engines to name a few. The air compressors are available in various capacities and types. Mainly there are two types of compressor is driven by prime mover such as diesel engines or electric motor or sometimes turbine through crankshaft. In this paper crankshaft was designed by considering torsional and bending moments. After designed model was developed in Creo. Static structural and transient analysis was carried out in ANSYS.