This paper reports on the development of a wireless portable apparatus for measuring joint angles of fingers. To measure motions of(Okinawa traditional) dance, a magnetic motion capture system and a data glove are used in our study. However, the data glove has an electric wire to output its detected signals, which causes motions of dancers to be constrained. So, we made the data transmission system for angles of fingers and considered whether it was possible to transmit multichannel data in real time by using it.