A contact plate is provided in obliquely opposing relation to a flange part of a high-voltage side discharge electrode disposed in a high-voltage chamber of a CRT socket. A movable urging member is movable into and away from a place where the urging member presses the contact plate against the flange part. A lead insertion hole is bored through the high-voltage chamber above the contact plate so that a high-voltage lead can be inserted through the lead insertion hole into between the contact plate and the flange.
