Abstract: A mounting structure includes an electrical circuit board provided with at least one through hole. An electrical component is electrically connected to the electrical circuit board. The electrical component includes an insulating housing. A holding member has a plate-like base fixed to the insulating housing. The base has a protrusion extending there from. Opposing plate-like first legs extend from the protrusion and interfere with an inside surface of the through hole for securing the holding member to the through hole in the electrical circuit board. A plate-like second leg extends from the protrusion in the same direction as the first legs. The second leg is arranged between the first legs.