A filter component assembly kit includes a bobbin that is configured with first and second members and a core that is in a quadrangular frame shape. When the first member is assembled with the second member, a through hole is formed in the bobbin. The through hole extends in a first direction. The core is configured with first and second extension bars. The first and second extension bars extend in parallel in the first direction. When the first extension bar is disposed in the through hole of the bobbin, rotation of the core around the first extension bar is prevented. First allowance of the first extension bar in a second direction, which is perpendicular to the first direction, in the through hole is larger than second allowance of the first extension bar in a third direction, which is perpendicular to the first and second directions, in the through hole.