A printer, comprising: a medium supply portion configured to supply a print medium; feeding means configured to feed the print medium supplied from the medium supply unit along a medium feed path of a paper passing route; printing means disposed in the medium feed path of a paper passing route to print on the print medium; a first damper portion configured to swing so that a medium contact portion of the first damper portion, which contacts the print medium in the medium feed path of a paper passing route, gives tension to the print medium between the printing means and the medium supply portion; characterized in that the printer further comprising: a second damper portion configured to swing so that a medium contact portion of the second damper portion, which contacts the print medium in the medium feed path of a paper passing route, gives tension to the print medium between the printing means and the medium contact portion of the first damper portion, and between the medium contact portion of the first damper portion and a chassis surface facing the medium contact portion of the first damper portion, wherein the print medium is loaded with a paper passing route contacting the second damper portion or a paper passing route contacting both the first damper portion and the second damper portion. a medium supply portion configured to supply a print medium; feeding means configured to feed the print medium supplied from the medium supply unit along a medium feed path of a paper passing route; printing means disposed in the medium feed path of a paper passing route to print on the print medium; a first damper portion configured to swing so that a medium contact portion of the first damper portion, which contacts the print medium in the medium feed path of a paper passing route, gives tension to the print medium between the printing means and the medium supply portion; characterized in that the printer further comprising: a second damper portion configured to swing so that a medium contact portion of the second damper portion, which contacts the print medium in the medium feed path of a paper passing route, gives tension to the print medium between the printing means and the medium contact portion of the first damper portion, and between the medium contact portion of the first damper portion and a chassis surface facing the medium contact portion of the first damper portion, wherein the print medium is loaded with a paper passing route contacting the second damper portion or a paper passing route contacting both the first damper portion and the second damper portion. a second damper portion configured to swing so that a medium contact portion of the second damper portion, which contacts the print medium in the medium feed path of a paper passing route, gives tension to the print medium between the printing means and the medium contact portion of the first damper portion, and between the medium contact portion of the first damper portion and a chassis surface facing the medium contact portion of the first damper portion, wherein the print medium is loaded with a paper passing route contacting the second damper portion or a paper passing route contacting both the first damper portion and the second damper portion.