A cylinder printing jig is provided by which a table of a moving table-type printer is allowed to contact with a rotation roller to smoothly rotate a cylindrical print medium. The cylinder printing jig includes a base unit detachably fixed to a body of a moving table-type inkjet printer, a movable unit supported by the base unit, a first rotation roller rotatably connected to the movable unit, a second rotation roller rotatably connected to the movable unit at a position at which the second rotation roller does not contact the table of the printer, and an auxiliary wheel axially supported by the movable unit. The first rotation roller and the auxiliary wheel are placed on the table of the printer by the deadweight of the movable unit. The movement of the table causes the contact with the table to provide the rotation of the first rotation roller.