The present invention provides a coil that is able to form an induction electric field over a wide range, has high efficiency in generating an induction electric field, and is further able to suppress inductance to a small value. This coil (31) has first to n-th turns (311-31N). The first to n-th turns (311-31N) each have an actuation part (311a) for applying an electric current in one direction and a connection part (311b) for applying an electric current in a direction opposite to the first direction. Multiple actuation parts (311a) are disposed so as to be substantially parallel with each other and to lie along a surface of an object (1) or a surface approximate thereto. Multiple connection parts (311b) are disposed within spaces which do not face the surface of the object (1) across the actuation parts (311a) and which, at the same time, are positioned lateral to the extension direction of the actuation parts (311a).
