An antenna coil includes a first conductor pattern defining a first side, a second conductor pattern defining a second side, a third conductor pattern defining a third side, and a fourth conductor pattern defining a fourth side in each turn when viewed from a laminating direction of insulation layers, the first conductor pattern is provided on a first layer, the second conductor pattern is provided on a second layer, which differs from the first layer, and the third conductor pattern and the fourth conductor pattern extend across the first layer and the second layer, and the first through fourth conductor patterns are disposed on the respective insulation layers so that the direction of a line obtained by sequentially connecting, on a turn-by-turn basis, centers of gravity of winding shapes each of which is configured by the conductor patterns defining one turn is slanted relative to the laminating direction of the insulation layers.