A hypodermic syringe provides a simple mechanism for manually retracting its needle into the syringe after injection has been completed. In some aspects, the light projected on the surface substantially indicates a distance between the surface and the focal area. Moreover, in TFT formed with the semiconductor film, the variation of the on-current in addition to the mobility can be also suppressed. The antenna box can receive the energizing signal from the antenna cable in a transmit mode and provide the implanted sensor response signal to the antenna cable in a receive mode. The compound of the present invention shows an anti-hepatitis C virus action based on the HCV polymerase inhibitory activity, and is useful as a therapeutic agent or prophylactic agent for hepatitis C.