A sheet processing apparatus characterized by comprising: a first processing section which forms a plurality of first processing lines (LX1, LX2), extending in a first direction (X) on a sheet as an object to be processed by selectively making a plurality of tools contact with and release from the sheet , and relatively moving the plurality of tools to the first direction (X) with respect to the sheet , at a first position,the plurality of tools comprising a plurality of blades to cut the sheet ; a second processing section which forms a plurality of second processing lines (LY1, LY2), extending in a second direction (Y) orthogonal to the first direction (X) on the sheet by selectively making a plurality of tools contact with and release from the sheet and relatively moving the plurality of tools to the second direction (Y) with respect to the sheet , at a second position, the plurality of tools comprising the plurality of blades to cut the sheet ; a third processing section which forms a third processing line, that is an aslant line or a curved line, on the sheet , by making a blade contact with and release from the sheet , and relatively moving the sheet and the blade , at a third position, the blade being configured to cut the sheet ; a conveyance mechanism which conveys the sheet among the first position, the second position, and the third position; an up-down moving motor which causes a movement of a blade which cuts the sheet in a third direction (Z) orthogonal to the first direction (X) and the second direction (Y); and an angle adjustment motor which causes a rotation of the blade around an axis along the third direction (Z). a first processing section which forms a plurality of first processing lines (LX1, LX2), extending in a first direction (X) on a sheet as an object to be processed by selectively making a plurality of tools contact with and release from the sheet , and relatively moving the plurality of tools to the first direction (X) with respect to the sheet , at a first position,the plurality of tools comprising a plurality of blades to cut the sheet ; a second processing section which forms a plurality of second processing lines (LY1, LY2), extending in a second direction (Y) orthogonal to the first direction (X) on the sheet by selectively making a plurality of tools contact with and release from the sheet and relatively moving the plurality of tools to the second direction (Y) with respect to the sheet , at a second position, the plurality of tools comprising the plurality of blades to cut the sheet ; a third processing section which forms a third processing line, that is an aslant line or a curved line, on the sheet , by making a blade contact with and release from the sheet , and relatively moving the sheet and the blade , at a third position, the blade being configured to cut the sheet ; a conveyance mechanism which conveys the sheet among the first position, the second position, and the third position; an up-down moving motor which causes a movement of a blade which cuts the sheet in a third direction (Z) orthogonal to the first direction (X) and the second direction (Y); and an angle adjustment motor which causes a rotation of the blade around an axis along the third direction (Z). <EOS>