Printer

A printer, comprising:

• a printer body including an installation area where a recording medium is installed;
• a print head that prints information on the recording medium;
• a controller;
• a movable guide that guides the side of the recording medium in the installation area;
• and
• a first switch that detects a position of the movable guide attached to the installation area, wherein
• the movable guide is provided on each side of the installation area and each includes
• a sidewall,
• a first holder disposed on an inner side of the sidewall,
• a second holder disposed on an inner side of the first holder, a step being formed between the first holder and the second holder, and
• a second switch that detects whether the recording medium is placed in the first holder or in the second holder;
• and
• the controller performs a print control process corresponding to the width of the recording medium based on information obtained by the first switch and information obtained by the second switch.