A precision machining/measurement device and a robot that conveys a workpiece to the device are covered by a cover, and a space covered by the cover is partitioned by a partition cover into a space where the precision machining/measurement device is installed and a space where the robot is installed. When a temperature inside the space where the robot is installed falls within a predetermined temperature range, a door provided in the partition cover is opened, and the robot supplies the workpiece to the precision machining/measurement device through the opened door.