An inkjet printer for aqueous ink with an unwinding portion and an adjacent winding portion in an uneven arrangement, comprising an unwinding portion for a web-shaped print base material , in which the unwinding roll of the unwinding portion is rotated through use of a drive belt; a single-pass inkjet head portion configured to discharge an aqueous ink to a surface of the web-shaped print base material unwound by a single-pass method; an adjacent winding portion , which is provided adjacent to the unwinding portion , and is configured to wind the web-shaped print base material , in which the winding roll of the adjacent winding is rotated through use of a drive belt, characterized in that it further comprises; a single motor that rotates the unwinding roll of the unwinding portion and the winding roll of the adjacent winding portion in synchronization with each other; a surface heating portion configured to heat at least a surface of the web-shaped print base material having the aqueous inks discharged thereto; a heating box , in which the web-shaped print base material having the aqueous inks discharged thereto, is conveyed on a roll inside the heating box , and the heating box is covered with heat insulation walls having a heat insulation structure, and has an inlet for the web-shaped print base material and an outlet for the web-shaped print base material, the unwinding portion and the adjacent winding portion are both installed side by side in an uneven arrangement on one of an upstream side (U) and a downstream side (D) of the single-pass inkjet head portion the unwinding roll of the unwinding portion and the winding roll of the adjacent winding portion is rotated in synchronization with each other through use of the single motor an unwinding portion for a web-shaped print base material , in which the unwinding roll of the unwinding portion is rotated through use of a drive belt; a single-pass inkjet head portion configured to discharge an aqueous ink to a surface of the web-shaped print base material unwound by a single-pass method; an adjacent winding portion , which is provided adjacent to the unwinding portion , and is configured to wind the web-shaped print base material , in which the winding roll of the adjacent winding is rotated through use of a drive belt, characterized in that it further comprises; a single motor that rotates the unwinding roll of the unwinding portion and the winding roll of the adjacent winding portion in synchronization with each other; a surface heating portion configured to heat at least a surface of the web-shaped print base material having the aqueous inks discharged thereto; a heating box , in which the web-shaped print base material having the aqueous inks discharged thereto, is conveyed on a roll inside the heating box , and the heating box is covered with heat insulation walls having a heat insulation structure, and has an inlet for the web-shaped print base material and an outlet for the web-shaped print base material, the unwinding portion and the adjacent winding portion are both installed side by side in an uneven arrangement on one of an upstream side (U) and a downstream side (D) of the single-pass inkjet head portion the unwinding roll of the unwinding portion and the winding roll of the adjacent winding portion is rotated in synchronization with each other through use of the single motor <EOS>