PROBLEM TO BE SOLVED: To provide an electricity transmission apparatus of relative rotary section which allows for efficient transmission of power or signals, without causing the problems of breakage of wire, working temperature, and environment.SOLUTION: An electricity transmission apparatus of relative rotary section includes a pair of magnetic elements 1A, 1B rotatable relatively each other on the coaxial core. The pair of magnetic elements 1A, 1B consist of a coil 3 and a core 2, respectively, and the coils 3 are located radially inside and outside each other, and coupled magnetically. Any one or both of electricity and electric signals are transmitted by the magnetic coupling. One magnetic element 1A is convex while the other magnetic element 1B is concave, and they are fitted to each other.SELECTED DRAWING: Figure 1【課題】断線や使用温度、環境上の問題が生じず、かつ大型化することなく効率良く電力や信号の伝送が行える相対回転部の電気伝送装置を提供する。【解決手段】互いに同軸心上で相対回転可能な一対の磁性素子１Ａ，１Ｂを備える。これら一対の磁性素子１Ａ，１Ｂは、それぞれコイル３とコア２とでなり、かつ前記コイル３が互いに径方向の内外に位置して磁気結合される。この磁気結合によって電力および電気信号のいずれか一方または両方を伝送する。一方の磁性素子１Ａは凸形とされ、他方の磁性素子１Ｂは凹形とされ、互いに嵌まり合う。【選択図】図１
