PURPOSE: To always continue transmission without a pause by constituting any of opposed heads by the combination of plural units even when a relative relation of position between a moving body of a machine provided with the opposed head and a stationary body is considerably fluctuated to some degree.

CONSTITUTION: A power transmission head 1 equipped with a stationary part of,e.g., a machine consists respectively of a coil 6-1 and a capacitor 5-1 as major components. A power reception head 2 equipped with a moving part is constituted by arranging plural units such as a unit 10 comprising a coil 6-2 and a capacitor 5-2 as major components and equivalent units 11, 12 thereto in a line at each prescribed interval. When the units 10∼12 or the like of the power reception head 2 equipped with moving part are reciprocated linearly at a large stroke, any of the units opposes to the power transmission head 1 of the stationary part without fail. Thus, required operation is continued without a pause.