To reduce electric power consumption, while restraining reduction in paper carrying accuracy, by flatly bringing paper into close contact with a platen surface by suction force more than necessary for restraining a curl of roll paper in an ink jet printer.

This printer is provided with a paper residual quantity measuring means, a paper residual quantity storage means, a sucking means bringing the roll paper into close contact with a platen, a suction force determining means determining a control quantity of the sucking means by a paper kind and a paper residual quantity of roll paper, and a suction control means, and also determines the control quantity of the sucking means with every combination of the paper kind and the paper residual quantity, by taking into consideration the fact that the curl of the roll paper depends on the paper kind in the suction force determining means and becomes large for approaching a core. The problem is solved by changing the control quantity of suction force by the paper kind and the paper residual quantity in printing.