It aims to provide an inkjet printer and a printing method that appropriately performs printing with high accuracy on print objects having various shapes. As a solution therefor, an inkjet printer is configured to perform printing using an inkjet scheme on a print object and includes an inkjet head that discharges ink droplets, a guide rail that retains the inkjet head by making the inkjet head face the print object and that is a Y direction extending member extending in a predeterminedly set Y direction, and an X direction driving section that moves the guide rail in an X direction and upon printing, the inkjet head moves along the guide rail and discharges ink droplets toward the print object, and the X direction driving section includes a ball screw and moves the guide rail in the X direction in accordance with a rotation amount of the ball screw.