Abstract: The sheet slitting apparatus 1 comprises a disk-like slitting blade 23 and a guiding member 52. The slitting blade 23 rotates along the direction of the sheet feeding, and can move in a direction crossing over the sheet feeding direction. The blade-guides 52 is located in opposition to the slitting blade 23 and comprises a plurality of blade-guides which are arranged juxtaposed each other in a direction crossing that of the sheet feeding, and can displace elastically along the direction of their own arrangement, respectively. The sheet S is fed between the slitting blade 23 and the guiding member 52, and the tip of the slitting blade 23 intrudes between adjacent blade-guides 50 thereby slitting the sheet S along the longitudinal direction thereof.