A solid electrolytic capacitor having significantly lowered its ESL is provided. In one embodiment, a first inverter includes selectable current paths between the buffer output and Vddground. A plurality of second transverse grooves situated at an inner portion of the tread portion extends toward the one side in the circumferential direction of the tire and is connected to outer longitudinal grooves, as it gradually extends from the inner side of the width direction of the tire to the outer side thereof.