An ink jet printer that appropriately performs printing with high accuracy on a three-dimensional object for a portable terminal is provided. The ink jet printer includes an ink jet head that discharges ink droplets, and a print object retaining section that retains a three-dimensional objects. The print object retaining section includes a shaft member extending in a direction perpendicularly intersecting a discharging direction of the ink droplets, a housing section being a shaft retaining section that retains the shaft member in a rotatable manner, a work set member being a three-dimensional object fixing member that is a fixing member fixing the three-dimensional objects relative to the shaft member, and causes the three-dimensional objects to rotate together with the shaft member by being fixed relative to the shaft member, and a rotation driving section being a rotation stopping means for stopping rotation of the shaft member at a predeterminedly set position.