An electromagnetic coupling device comprising: an electromagnetic coil formed by winding a magnet wire including a winding start end and a winding termination end; a pair of external connection lead wires including a first lead wire and a second lead wire; a field core including a recessed portion containing the electromagnetic coil, and a hole passing through a wall of the recessed portion; and a terminal block inserted in the hole and supported by the field core, wherein the terminal block includes: a terminal portion projecting outside the field core; a pair of terminals provided at the terminal portion and including a first terminal and a second terminal; and a first pair of through holes including a first through hole and a second through hole that pass through the terminal block via the first terminal and the second terminal, respectively, and make an outside of the field core and an inside of the recessed portion communicate with each other, the winding start end passes through the first through hole and projects from the first terminal, and the winding termination end passes through the second through hole and projects from the second terminal, characterized in that the winding start end is soldered to the first terminal together with the first lead wire and that the winding termination end is soldered to the second terminal together with the second lead wire. an electromagnetic coil formed by winding a magnet wire including a winding start end and a winding termination end; a pair of external connection lead wires including a first lead wire and a second lead wire; a field core including a recessed portion containing the electromagnetic coil, and a hole passing through a wall of the recessed portion; and a terminal block inserted in the hole and supported by the field core, wherein the terminal block includes: a terminal portion projecting outside the field core; a pair of terminals provided at the terminal portion and including a first terminal and a second terminal; and a first pair of through holes including a first through hole and a second through hole that pass through the terminal block via the first terminal and the second terminal, respectively, and make an outside of the field core and an inside of the recessed portion communicate with each other, the winding start end passes through the first through hole and projects from the first terminal, and the winding termination end passes through the second through hole and projects from the second terminal, characterized in that the winding start end is soldered to the first terminal together with the first lead wire and that the winding termination end is soldered to the second terminal together with the second lead wire. a terminal portion projecting outside the field core; a pair of terminals provided at the terminal portion and including a first terminal and a second terminal; and a first pair of through holes including a first through hole and a second through hole that pass through the terminal block via the first terminal and the second terminal, respectively, and make an outside of the field core and an inside of the recessed portion communicate with each other, the winding start end passes through the first through hole and projects from the first terminal, and the winding termination end passes through the second through hole and projects from the second terminal, characterized in that the winding start end is soldered to the first terminal together with the first lead wire and that the winding termination end is soldered to the second terminal together with the second lead wire.