Autonomos Underwater Vehicles have many applications in scientific, military, and commercial area due to its autonomy. In this paper, depth controller design for AUV and its performance test results are presented. Control system design is done using the PD control scheme based on a mathematical model of the AUV. Details of system implementation are given and the results of simulations with the prototype vehicle model are discussed. The simulation results show the applicability of the designed controller under sensor noise and external disturbance conditions.