Medium transport device and medium processing device using the same

A medium transport device comprising:

• a transport belt that is disposed in such a manner as to face an image holding unit comprising a belt-shaped intermediate transfer body holding an image and that is capable of moving circularly so as to transport a medium;
• a first stretching roller that stretches a portion of the transport belt and that is disposed in such a manner as to face the image holding unit, the first stretching roller being configured to transport the medium by nipping the medium between the image holding unit and the transport belt and configured to transfer the image held by the image holding unit onto the medium;
• a second stretching roller that stretches a portion of the transport belt that is located downstream from the portion of the transport belt stretched by the first stretching roller in a transport direction of the medium;
• a contact adjusting unit comprising a link arm that causes a second end of the first stretching roller in an axial direction of the first stretching roller to swing while a first end of the first stretching roller serves as a fulcrum and adjusts a contact state between the image holding unit and the transport belt in a longitudinal direction of a contact region between the image holding unit and the transport belt;
• and
• a position adjusting unit comprising a displacement adjustment plate that keeps a distance between a center of the first stretching roller and a center of the second stretching roller constant and adjusts a position of the second stretching roller with respect to the first stretching roller by causing a second end of the second stretching roller to swing while a first end of the second stretching roller serves as a fulcrum.