To provide a receiving electromagnetic coil enabling long-distance transmission of signals by sufficiently suppressing noise signals which are due to the components of external electric field.

Magnetic flux which is generated by supplying a current to a transmission electromagnetic coil included in a transmission device placed in the earth or water is received, and a receiving electromagnetic coil 20 included in a receiving device placed on sea or the earth is provided with an electric field shield for forming an electrically insulating area with respect to the periphery of the winding direction of a coil winding 21. The electric field shield includes a non-magnetic metallic band 23 using a non-magnetic material wound helically around the outside of a first insulating material 22 which is provided at the outside of the coil winding 21, and a second insulating material 24 provided between areas where the start and finish of the winding of the non- magnetic metallic band 23 cross each other.