Recently, social problems about "Food" are frequently reported such as BSE and camouflage-agricultural product, chemical residues and so on. Accurate traceability information on agricultural production is very important and necessary for solving the problems. To establish the traceability system, sensors collecting information of agricultural products, equipments of network and database are essential. In other words, it is necessary for informatization-agriculture to introduce innovative mechanical systems with a large scale memory function of PC. In this research, development of a mobile citrus fruit grading grading robot is one of objectives. This precision agriculture oriented robot brings labor reduction, farming guidance, quality improvement, environment conservation, and security and safety information. In this paper, constitution of the mobile grading robot and its monitoring camera are described.