We use Remotely Operated Vehicle (ROV) for capture sea urchin. Sometimes ROV hard to catch sea urchin on a specific terrain. ROV used sea urchin capture unit, but sometimes it didn’t work because the end of unit is short and can’t control it directly. So, we developed Sub System for ROV. It can change the pitch angle up and down with two thrusters. And It have several sensors, will help our work. This paper describes the composition of Sub System and experiment results using it in the real work.