Printer

A printer comprising a printer main body that performs printing on a long medium, a supporting frame that supports the printer main body from a lower side, a tension applying mechanism including a tension bar that comes into contact with a medium before printing and applies a tension to the medium, and a first roll attaching portion and a second roll attaching portion to which the medium before printing wound into a roll shape is attachable, wherein

• the first roll attaching portion, the tension bar, and the second roll attaching portion are disposed on one side of the supporting frame in a first direction, which is one direction in a horizontal direction, and are disposed in such order from the supporting frame side in the first direction;
• a medium after printing is wound into the roll shape on another side of the supporting frame in the first direction;
• assuming that the medium before printing wound into the roll shape and attached to the first roll attaching portion is a first roll and the medium before printing wound into the roll shape and attached to the second roll attaching portion is a second roll,
• a maximum outer diameter of the second roll is larger than a maximum outer diameter of the first roll;
• and
• the tension applying mechanism includes a frame in which a guide groove having a slit shape for guiding the tension bar in a vertical direction is formed.