To obtain satisfactory print quality according to various receiving sheets of paper (in particular, according to a combination of a sheet of receiving paper and an ink ribbon).

The printer is brought into pressure-contact with a printing medium between a member subjected to pressure-contact and a printing head and prints information to the printing medium by the heat generation of the printing head. The printer includes an adjusting means, a detecting means, and a control means. The adjusting means adjusts the pressure-contact force of the printing head with the member subjected to pressure-contact according to the kind of the printing medium. A detecting means detects the pressure contact force of the printing head adjusted by the adjusting means. The control means controls the amount of heat generated by the printing head according to the pressure-contact force detected by the detecting means.