To provide a printer which can perform high quality printing on a plurality of divided print areas of a medium.

When the heater parts 62a and 62b of thermal heads 61a and 61b are pushed down by applying a pressing force to an arm supporting shaft 60c to press the print areas 42a and 42b of a large ticket 42 under carriage, an arm 60 rotates about the arm supporting shaft 60c and the two thermal heads 61a and 61b rotate about supporting shafts 60a and 60b and thereby the heater parts 62a and 62b abut entirely against the print areas 42a and 42b of the large ticket 42. Since the heater parts 62a and 62b of the thermal heads 61a and 61b abut entirely against the print areas 42a and 42b of the large ticket 42, the print areas 42a and 42b can be printed substantially uniformly.