<p>Provided is a coil part for use in an antenna coil wherein its production efficiency and sensitivity can be improved. The coil part (10) includes a cross core having a first winding frame part (22) which extends in a first direction and on which a coil (30) is disposed and a second winding frame part (22) which extends in the direction intersecting the first direction and on which a coil (30) is disposed. The cross core is structured by fitting a first core (20a) having the first winding frame part (22) to a second core (20b) having the second winding frame part (22).</p>
