To provide a mounting structure of coil parts which provides a function as an LC composite type part to appropriately expand an insert loss toward a high frequency side.

In the mounting structure M of a coil part, a mounting board 20 is loaded with a coil part 10 comprising: a pair of first and second coils 12 and 13 in which two wires coated with an insulating film are bifilar-wound on a winding stem 11A of a core 11; and two pairs of first and second terminal electrodes 14A and 14B as well as 15A and 15B formed to flanges 11B and 11B of the core 11, being connected to both ends of the first and second coils 12 and 13. In the first coil 12, the first terminal electrodes 14A and 14B at both ends are connected to signal lines 21. In the second coil 13, the second terminal electrode 15A at one end is connected to a ground line 22 while the second terminal electrode 15B at the other end is electrically open.

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