An improved construction of a through-type capacitor suitable for used with a magnetron is disclosed. The through-type capacitor comprises a dielectric member formed with a through hole at the center thereof, a central conductor inserted into the through hole, and electrodes formed on the outer peripheral surface of the dielectric member and the inner peripheral surface of the through hole. The electrode on the inner peripheral surface of the through hole is connected by solder to the central conductor. The central conductor and the dielectric member have a portion free of solder therebetween in which the solder is expandable.