Among the areas related to fields of high tech, including the electronics industry and the Production of medical and food products those places requiring a particularly high degree of cleanliness are installing clean rooms. When clean rooms are put into operation for the purpose of assuring a high degree of cleanliness, which is the functional objective of these clean rooms, it is vitally important to measure the volume of dust leakage from the air purification filter. This operation, however, is particularly unpopular with human personnel due to the fact that these operations are preformed high above ground. Due to the foregoing reasons, our company sought to robotize these operations. The robot that we will introduce here is different from the conventional type. We have simplified robot control by providing it with the function to automatically detect the position of the filter that is the object of measurement.