A first movable blade and a second movable blade cooperate as part of a cutter drive mechanism to cut roll paper in conjunction with a fixed blade. A gear train 132 has a first gear 141 that rotates when drive power from the cutter motor 131 is input thereto, and a second gear 142 to which rotation of the first gear 141 is transferred, causing the second gear 142 to turn. A first eccentric pin 151 engaging the first movable blade 81 is disposed at an eccentric position to the first gear 141, and a second eccentric pin 152 engaging the second movable blade 82 is disposed at an eccentric position to the second gear 142. The first movable blade 81 has a first guide channel 115 regulating the cutting operation of the first movable blade 81 on the first blade point 114 side, and the first guide channel 115 and the first eccentric pin 151 together render a first opposing cam 161. The second movable blade 82 has a second guide channel 125 regulating the cutting operation of the second movable blade 82 on the second blade point 124 side, and the second guide channel 125 and the second eccentric pin 152 together render a second opposing cam 162.