An inkjet-type vehicle painting machine for performing painting by ejecting paint from nozzles onto a vehicle located on a painting line, the inkjet-type vehicle painting machine comprising: a nozzle head having a plurality of the nozzles; a robot arm (23 to 27) capable of assembling the nozzle head to a front end portion and moving the assembled nozzle head; an arm control portion for controlling the operation of the robot arm (23 to 27); a head control portion for controlling a driving of the nozzle head; and painting data forming means (100 and 110) for forming, based on a painting range corresponding to a vehicle to be painted, painting data that is used for controlling a driving of the nozzle head by means of the head control portion, a plurality of nozzle columns composed of the nozzles being arranged obliquely relative to a long side direction of the nozzle head, the nozzle columns being provided with a first nozzle column that is located on one side in a scanning direction of the nozzle head and a second nozzle column that is located on the other side in the scanning direction, the first nozzle column and the second nozzle column being configured in a state where the droplets ejected from the nozzles in the second nozzle column are ejected in the middle of the droplets ejected from adjacent nozzles in the first nozzle column when the long side direction of the nozzle head is orthogonal to the scanning direction, the painting data forming means (100 and 110): forming trajectory data for driving the robot arm (23 to 27) to move the nozzle head, and forming, based on the trajectory data, posture data for keeping the long side direction of the nozzle head perpendicular relative to a main scanning direction of the nozzle head, and the arm control portion controlling the robot arm (23 to 27) based on the trajectory data and the posture data, so that the long side direction of the nozzle head is kept perpendicular relative to the main scanning direction in a state where the nozzle head moves along the main scanning direction and the paint is ejected from the nozzles. a nozzle head having a plurality of the nozzles; a robot arm (23 to 27) capable of assembling the nozzle head to a front end portion and moving the assembled nozzle head; an arm control portion for controlling the operation of the robot arm (23 to 27); a head control portion for controlling a driving of the nozzle head; and painting data forming means (100 and 110) for forming, based on a painting range corresponding to a vehicle to be painted, painting data that is used for controlling a driving of the nozzle head by means of the head control portion, a plurality of nozzle columns composed of the nozzles being arranged obliquely relative to a long side direction of the nozzle head, the nozzle columns being provided with a first nozzle column that is located on one side in a scanning direction of the nozzle head and a second nozzle column that is located on the other side in the scanning direction, the first nozzle column and the second nozzle column being configured in a state where the droplets ejected from the nozzles in the second nozzle column are ejected in the middle of the droplets ejected from adjacent nozzles in the first nozzle column when the long side direction of the nozzle head is orthogonal to the scanning direction, the painting data forming means (100 and 110): forming trajectory data for driving the robot arm (23 to 27) to move the nozzle head, and forming, based on the trajectory data, posture data for keeping the long side direction of the nozzle head perpendicular relative to a main scanning direction of the nozzle head, and the arm control portion controlling the robot arm (23 to 27) based on the trajectory data and the posture data, so that the long side direction of the nozzle head is kept perpendicular relative to the main scanning direction in a state where the nozzle head moves along the main scanning direction and the paint is ejected from the nozzles. forming trajectory data for driving the robot arm (23 to 27) to move the nozzle head, and forming, based on the trajectory data, posture data for keeping the long side direction of the nozzle head perpendicular relative to a main scanning direction of the nozzle head, and the arm control portion controlling the robot arm (23 to 27) based on the trajectory data and the posture data, so that the long side direction of the nozzle head is kept perpendicular relative to the main scanning direction in a state where the nozzle head moves along the main scanning direction and the paint is ejected from the nozzles.