Recently, Autonomous Underwater Vehicle (AUV) has been developed by many organizations. However, These AUVs are developed for Deep Ocean. Therefore, these AUVs need support ship and many people. In this research, we aim to develop a small and light-weight AUV for coastal survey. In costal survey, the robot doesn't need the big scale and a lot of equipment. Therefore, we designed a small and light-weight robot. In this paper, we explain how to develop the AUV. Also, we report the result of stress analysis of parts which developed by bear the stress.