Oviposition responses ofExorista japonicaTownsend to host models compared to host larvae,Mythimna separataWalker (Lepidoptera: Noctuidae), were investigated. Total number of examinations of a host model with forelegs during 10 min and the number of eggs laid on a host or host model during 24 h were observed daily for 40 days. Semi-cylindrical black rubber tubes (4.0×1.0×0.5 cm) were provided as host models. The pattern of daily oviposition on host models was similar to that on hosts; oviposition peaked on the 6th to 7th days after adult emergence. However, flies oviposited very few eggs on host models compared to hosts. Previous oviposition experience onM. separatadid not affect the acceptance of host models or the number of eggs laid on host models. At first, the pattern of daily examination of a host model was related to the oviposition pattern, while afterwards, it varied independently.