An inkjet printer comprising: a conveying part to convey a printing medium in a predetermined direction; a printing part to print on a printing face of the printing medium conveyed by the conveying part; an exhaust part to collect ink mist generated at the printing part; and a blowing part; wherein the printing part comprises a box, and a plurality of print heads (21-1 ∼ 21-4) spaced apart in a conveying direction of the printing medium inside the box, the blowing part comprises an air blower, a plurality of vents (35, 36) respectively provided at the respective print heads (21-1 - 21-4) on an upstream side in the conveying direction of the printing medium, an air blowing path which connects an ejection port of the air blower and the respective vents (35, 36) respectively, and blowout air volume control means for respectively adjusting blowout air volume of the respective vents, the exhaust part comprises at least one exhaust blower, a plurality of collection ports (45, 46) respectively provided at the respective print heads (21-1 - 21-4) on a downstream side in the conveying direction of the printing medium, at least one exhaust path which connects a suction port of the at least one exhaust blower and respective collection ports (45, 46) respectively, an ink mist collecting part provided in the exhaust path and configured to liquefy ink mist contained in the air sucked from respective collection ports (45, 46), a mist storage tank in which liquefied ink mist is to be stored and a suction air volume control means for respectively adjusting suction air volume of the respective collection ports (45, 46), and the air blower, the exhaust blower, the blowout air volume control means, the ink mist collecting part and the suction air volume control means are provided outside the box, characterized in that the ink mist collecting part comprises an inflow chamber which has an inlet hole at an upper part and which is opened at a lower part and an outflow chamber which has an outlet hole at an upper part and which is opened at a lower part, wherein the inlet hole is connected to the collection ports (45, 46), the outlet hole is connected to the suction port of the exhaust blower, so that air containing ink mist flows from the upper part to the lower part of the inflow chamber, flows in the lower part of the outflow chamber and flows from the lower part to the upper part of the outflow chamber, filters are provided in the inflow chamber and the outflow chamber respectively to liquefy ink mist while the air passes there-through, the mist storage tank is provided below the inflow chamber and the outflow chamber, and a drain valve for discharging the liquefied ink mist within the mist storage tank is provided. a conveying part to convey a printing medium in a predetermined direction; a printing part to print on a printing face of the printing medium conveyed by the conveying part; an exhaust part to collect ink mist generated at the printing part; and a blowing part; wherein the printing part comprises a box, and a plurality of print heads (21-1 ∼ 21-4) spaced apart in a conveying direction of the printing medium inside the box, the blowing part comprises an air blower, a plurality of vents (35, 36) respectively provided at the respective print heads (21-1 - 21-4) on an upstream side in the conveying direction of the printing medium, an air blowing path which connects an ejection port of the air blower and the respective vents (35, 36) respectively, and blowout air volume control means for respectively adjusting blowout air volume of the respective vents, the exhaust part comprises at least one exhaust blower, a plurality of collection ports (45, 46) respectively provided at the respective print heads (21-1 - 21-4) on a downstream side in the conveying direction of the printing medium, at least one exhaust path which connects a suction port of the at least one exhaust blower and respective collection ports (45, 46) respectively, an ink mist collecting part provided in the exhaust path and configured to liquefy ink mist contained in the air sucked from respective collection ports (45, 46), a mist storage tank in which liquefied ink mist is to be stored and a suction air volume control means for respectively adjusting suction air volume of the respective collection ports (45, 46), and the air blower, the exhaust blower, the blowout air volume control means, the ink mist collecting part and the suction air volume control means are provided outside the box, characterized in that the ink mist collecting part comprises an inflow chamber which has an inlet hole at an upper part and which is opened at a lower part and an outflow chamber which has an outlet hole at an upper part and which is opened at a lower part, wherein the inlet hole is connected to the collection ports (45, 46), the outlet hole is connected to the suction port of the exhaust blower, so that air containing ink mist flows from the upper part to the lower part of the inflow chamber, flows in the lower part of the outflow chamber and flows from the lower part to the upper part of the outflow chamber, filters are provided in the inflow chamber and the outflow chamber respectively to liquefy ink mist while the air passes there-through, the mist storage tank is provided below the inflow chamber and the outflow chamber, and a drain valve for discharging the liquefied ink mist within the mist storage tank is provided.