The authors developed an insect behavior analysis system to analyze the integration of several sensory information ethologically. Male silkworm moths generate the orientation behavior toward female silkworm moths by perceiving the pheromone which female moths released. But male silkworm moths utilize not only olfactory information but other sensory information for the orientation behavior. The analysis system is equipped with the visual stimulus device in addition to the olfactory stimulus device. The displacement compensating mechanism enables the behavior analysis keeping silkworm moth non-tethered.