Coil component, and substrate with integrated coil

A coil component comprising:

• a primary winding that generates a magnetic field by an input current from outside;
• and
• a secondary winding through which an induced current generated by the magnetic field flows,
• wherein the primary winding includes a plurality of primary first turns and a plurality of primary second turns, each of the primary first turns and each of the primary second turns being ring-shaped as viewed in a first direction,
• the secondary winding includes a plurality of secondary first turns and a plurality of secondary second turns, each of the secondary first turns and each of the secondary second turns being ring-shaped as viewed in the first direction,
• the plurality of primary first turns and the plurality of secondary first turns are alternately arranged in the first direction to form a first tubular portion,
• the plurality of primary second turns and the plurality of secondary second turns are alternately arranged in the first direction to form a second tubular portion,
• the second tubular portion is located inside the first tubular portion as viewed in the first direction, and
• a direction in which the input current flows in each of the plurality of primary first turns and a direction in which the input current flows in each of the plurality of primary second turns are the same.