Printer and tablet

A printer configured to print images on at least one of faces of a tablet having a first face and a second face opposite to the first face, comprising:

• a conveying device that conveys the tablet;
• a first image pickup device that picks up an image of the first face of the tablet while being conveyed;
• a first printing device that is disposed at a downstream side of the first image pickup device and that is configured to perform printing on the first face of the tablet while being conveyed;
• a first dividing line judging section that judges whether or not there is a groove-shaped dividing line on the first face based upon the image picked up by the first image pickup device;
• a first dividing line position calculating section that calculates the position of the dividing line based upon the image picked up by the first image pickup device;
• a second printing information calculating section that generates printing information for the second face of the tablet based upon the position calculated by the first dividing line position calculating section, and
• a second printing device performing printing on the second face of the tablet while being conveyed, based upon the printing information calculated by the second printing information calculating section.