A printing paper winding device for winding printing paper with a base material having a low resistance to bending stresses or printing paper having RFID labels carrying IC chips, comprising: a winding shaft for winding band-like printing paper (3, 40) on which printing has been performed by a printer; a drive unit for rotary driving the winding shaft; and a tension roller that comes into contact with the printing paper (3, 40) upstream of the winding shaft and can apply a tension to the printing paper (3, 40) by reciprocating in a prescribed tension region (R1, R2, R3, R4), following the winding of the printing paper, said printing paper winding device further comprising: a first sensor and a second sensor capable of detecting the portion of said tension region (R1, R2, R3, R4) in which said tension roller is positioned; and a winding control unit for determining, based on the output signals of the first sensor and second sensor, whether said tension region (R1, R2, R3, R4) in which said tension roller is positioned is a first tension region in which the bending angle of the winding path of said printing paper (3, 40) becomes minimum, a second tension region, a third tension region, or a fourth tension region in which the bending angle of the winding path of said printing paper (3, 40) becomes maximum, those tension regions (R1, R2, R3, R4) being arranged continuously and adjacently to each other; wherein said winding control unit controls said drive unit so as to limit the tension roller to the tension region (R1, R2, R3, R4) in which winding can be conducted in the direction such that said bending angle of said winding path that follows the winding of said printing paper (3, 40) is close to a more obtuse angle and thereby reducing bending stresses. a winding shaft for winding band-like printing paper (3, 40) on which printing has been performed by a printer; a drive unit for rotary driving the winding shaft; and a tension roller that comes into contact with the printing paper (3, 40) upstream of the winding shaft and can apply a tension to the printing paper (3, 40) by reciprocating in a prescribed tension region (R1, R2, R3, R4), following the winding of the printing paper, said printing paper winding device further comprising: a first sensor and a second sensor capable of detecting the portion of said tension region (R1, R2, R3, R4) in which said tension roller is positioned; and a winding control unit for determining, based on the output signals of the first sensor and second sensor, whether said tension region (R1, R2, R3, R4) in which said tension roller is positioned is a first tension region in which the bending angle of the winding path of said printing paper (3, 40) becomes minimum, a second tension region, a third tension region, or a fourth tension region in which the bending angle of the winding path of said printing paper (3, 40) becomes maximum, those tension regions (R1, R2, R3, R4) being arranged continuously and adjacently to each other; wherein said winding control unit controls said drive unit so as to limit the tension roller to the tension region (R1, R2, R3, R4) in which winding can be conducted in the direction such that said bending angle of said winding path that follows the winding of said printing paper (3, 40) is close to a more obtuse angle and thereby reducing bending stresses. a first sensor and a second sensor capable of detecting the portion of said tension region (R1, R2, R3, R4) in which said tension roller is positioned; and a winding control unit for determining, based on the output signals of the first sensor and second sensor, whether said tension region (R1, R2, R3, R4) in which said tension roller is positioned is a first tension region in which the bending angle of the winding path of said printing paper (3, 40) becomes minimum, a second tension region, a third tension region, or a fourth tension region in which the bending angle of the winding path of said printing paper (3, 40) becomes maximum, those tension regions (R1, R2, R3, R4) being arranged continuously and adjacently to each other; wherein said winding control unit controls said drive unit so as to limit the tension roller to the tension region (R1, R2, R3, R4) in which winding can be conducted in the direction such that said bending angle of said winding path that follows the winding of said printing paper (3, 40) is close to a more obtuse angle and thereby reducing bending stresses.