into the circular ring member 11 of the exciting coil 1 until the lower surface of the detecting coil 2 aligns with the lower surface of the exciting coil 1. [0059] Needless to say, the exciting coil 1 and the detecting coil 2 are not necessarily limited to the above-mentioned dimensions and material, and other dimensions and materials may be used. [0060] The eddy current testing probe constructed