In a head (21) of an inkjet printer, a plurality of outlet rows are arranged in a scanning direction, the plurality of outlet rows each having a plurality of outlets arranged in a direction intersecting the scanning direction. The plurality of outlets are each capable of forming dots of a plurality of sizes on printing paper upon receiving different driving signals from an ejection control part (44). In the inkjet printer, under control of the ejection control part (44), some of the outlet rows form dots of only one size out of the plurality of sizes, and the other outlet rows form dots of only another size. In this way, causing the plurality of outlets in each outlet row to form dots of only one size makes it possible to reduce the occurrence of satellite droplets or the like and improve print quality.