An inkjet printer comprising: a print unit configured to eject ink from a nozzle of an inkjet head while circulating the ink along a circulation path (22, 23, 28, 29, 30); a pressurized space (31, 51, 52) configured to be pressurized for circulation of the ink along the circulation path (22, 23, 28, 29, 30); a depressurized space (36, 58, 59) configured to be depressurized for the circulation of the ink along the circulation path (22, 23, 28, 29, 30); a main connection path (66a, 66b) connecting the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) to each other; an adjustment path (66b, 67) connecting the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) to each other, the adjustment path (66b, 67) formed by a portion of the main connection path (66a, 66b) and a path having an air passage narrower than an air passage of the main connection path (66a, 66b); an air pump arranged in the portion of the main connection path (66a, 66b) and configured to send air from the depressurized space (36, 58, 59) to the pressurized space (31, 51, 52); a changeover device configured to change over a usage path from the main connection path (66a, 66b) to the adjustment path (66b, 67) and vice versa, the usage path being a path used as an air passage between the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) in drive of the air pump; and a controller configured to drive the air pump with the main connection path (66a, 66b) set as the usage path by the changeover device to generate preset pressures respectively in the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) and then control the drive of the air pump with the usage path changed over to the adjustment path (66b, 67) by the changeover device to maintain pressures in the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) respectively at the preset pressures. a print unit configured to eject ink from a nozzle of an inkjet head while circulating the ink along a circulation path (22, 23, 28, 29, 30); a pressurized space (31, 51, 52) configured to be pressurized for circulation of the ink along the circulation path (22, 23, 28, 29, 30); a depressurized space (36, 58, 59) configured to be depressurized for the circulation of the ink along the circulation path (22, 23, 28, 29, 30); a main connection path (66a, 66b) connecting the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) to each other; an adjustment path (66b, 67) connecting the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) to each other, the adjustment path (66b, 67) formed by a portion of the main connection path (66a, 66b) and a path having an air passage narrower than an air passage of the main connection path (66a, 66b); an air pump arranged in the portion of the main connection path (66a, 66b) and configured to send air from the depressurized space (36, 58, 59) to the pressurized space (31, 51, 52); a changeover device configured to change over a usage path from the main connection path (66a, 66b) to the adjustment path (66b, 67) and vice versa, the usage path being a path used as an air passage between the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) in drive of the air pump; and a controller configured to drive the air pump with the main connection path (66a, 66b) set as the usage path by the changeover device to generate preset pressures respectively in the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) and then control the drive of the air pump with the usage path changed over to the adjustment path (66b, 67) by the changeover device to maintain pressures in the pressurized space (31, 51, 52) and the depressurized space (36, 58, 59) respectively at the preset pressures.