A board comprises a through hole including a first opening, a second opening opposite to the first opening, a first conductor formed on a part of the through hole, the first conductor extends from the first opening to a first predetermined position of the through hole, a second conductor formed on a part of the through hole, the second conductor extends from the second opening to a second predetermined position nearer to the second opening than the first predetermined position, and wherein the first conductor alternates with the second conductor with respect to the circumferential direction of the through hole.