Recently, the wireless power transmission (WPT) system is expected to employ as a means to transmit power to capsular endoscope diagnosing the digestive organs. In order to increase transmission efficiency, in this study, we proposed a transmitting spiral antenna which can transmit adequate power to the capsular endoscope with being independent of its position and direction. In this paper, we discussed the power transmission efficiency and SAR on human body by means of FDTD method and experimentation.