A conductive composition for filling a via. A clamping ring includes an inner groove sized to receive the flanges of the two adjacent pipes. The axial force member and the stiffening member can be easily connected in a dry manner by threads. A second insulating layer is formed over the etching stopper film. The medium transfer member is also at a first position where a rotational axis of the medium transfer member lies downstream of a rotational axis of the backup member in a medium transport direction.