To promptly detect the presence or absence of generation of the stick slip motion of a printing head.

The printer comprises the printing head which carries out printing to a medium, a motor for moving the printing head, a guide part for guiding the printing head along a predetermined direction, a motor control part which controls the motor, and a judging part which judges whether or not the printing head performs the stick slip motion on the basis of a control signal generated by the motor control part so as to control the motor when the motor control part controls the motor to move the printing head at a constant speed of a predetermined or lower speed along the guide part.