A coil component comprising: a first coil winding formed by joining a plurality of plate-like coil members (10, 12) in a ring shape having ends and wound around a first axis and having a portion defining an opening in the center thereof; a second coil winding formed of members of the same form as the first coil winding and wound around a second axis running along the first axis, juxtaposed to the first coil winding, and having a portion defining an opening in the center thereof; a connecting member configured to electrically connect together an end of the first coil winding to an end of the second coil winding, the connected ends of the first and second coil windings (2A, 2B) being disposed on the same side along the extending direction of the first axis and the second axis with respect to the first coil winding and the second coil winding; and a heat conductive member of an electrically insulating material and provided to contact the connecting member, wherein the first coil winding and the second coil winding are each wound such that magnetic flux is generated by a current flowing through the first coil winding and the second coil winding to pass through the opening of the first coil winding in one direction and through the opening of the second coil winding in an opposite direction to the direction passing through the opening of the first coil winding, characterized in that on an inner perimeter edge of each coil member (10, 12), a cutout portion (30, 32), where a portion of the respective coil member (10, 12) is outwardly cut out, is formed, and in an area of the outer perimeter edge of each coil member (10, 12) that is an extension of a line connecting a center axis (A1, A2) of the opening (52, 54) and the respective cutout portion (30, 32), a protrusion (34, 36), where a portion of the respective coil member (10, 12) is outwardly bulged, is provided such that the outer perimeter edge of the respective coil member (10, 12) becomes larger in a radial direction. a first coil winding formed by joining a plurality of plate-like coil members (10, 12) in a ring shape having ends and wound around a first axis and having a portion defining an opening in the center thereof; a second coil winding formed of members of the same form as the first coil winding and wound around a second axis running along the first axis, juxtaposed to the first coil winding, and having a portion defining an opening in the center thereof; a connecting member configured to electrically connect together an end of the first coil winding to an end of the second coil winding, the connected ends of the first and second coil windings (2A, 2B) being disposed on the same side along the extending direction of the first axis and the second axis with respect to the first coil winding and the second coil winding; and a heat conductive member of an electrically insulating material and provided to contact the connecting member, wherein the first coil winding and the second coil winding are each wound such that magnetic flux is generated by a current flowing through the first coil winding and the second coil winding to pass through the opening of the first coil winding in one direction and through the opening of the second coil winding in an opposite direction to the direction passing through the opening of the first coil winding, characterized in that on an inner perimeter edge of each coil member (10, 12), a cutout portion (30, 32), where a portion of the respective coil member (10, 12) is outwardly cut out, is formed, and in an area of the outer perimeter edge of each coil member (10, 12) that is an extension of a line connecting a center axis (A1, A2) of the opening (52, 54) and the respective cutout portion (30, 32), a protrusion (34, 36), where a portion of the respective coil member (10, 12) is outwardly bulged, is provided such that the outer perimeter edge of the respective coil member (10, 12) becomes larger in a radial direction.