To provide a card cutter having a function of being able to outwardly discharge chips caught between two rotary disk blades in a slitter cutting part of the card cutting device, by surely tearing off from the rotary disk blades.

A tip part of a guide member 27 having a discharging guide surface between thin blades 24b and 24c, is inserted up to the vicinity of a second rotary shaft 18 or a boss 26 between the thin blades 24b and 24c. The chips 39 sandwiched between the thin blade 24b and the thin blade 24c, are torn off from between the thin blades 24b and 24c, and are dropped along the guide surface of the guide member 27.