A 2nd signal line has impedance lower than impedance of a 1st signal line. A capacitor includes a 1st extension part and a 2nd extension part, a 1st ground part and a 2nd ground part. The 1st extension part and the 2nd extension part are connected to a 2nd signal line and are on an insulation substrate to extend along a longitudinal direction of the 2nd signal line. The 1st ground part and the 2nd ground part are at least a part of a ground pattern, and are between the 1st extension part and the 2nd extension part and the 2nd signal line, and between the 1st extension part and the 2nd extension part and an end part of the insulation substrate, to be electrically coupled with the 1st extension part and the 2nd extension part.