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 on a sheet as an object to be processed by selectively making a plurality of tools (10, 210) contact with and release from the sheet, and relatively moving the plurality of tools (10, 210) to the first direction with respect to the sheet, at a first position,the plurality of tools (10, 210) 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 orthogonal to the first direction on the sheet by selectively making a plurality of tools (10, 210) contact with and release from the sheet and relatively moving the plurality of tools (10, 210) to the second direction with respect to the sheet, at a second position, the plurality of tools (10, 210) 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 orthogonal to the first direction and the second direction; and an angle adjustment motor which causes a rotation of the blade around an axis along the third direction. a first processing section which forms a plurality of first processing lines (LX1, LX2), extending in a first direction on a sheet as an object to be processed by selectively making a plurality of tools (10, 210) contact with and release from the sheet, and relatively moving the plurality of tools (10, 210) to the first direction with respect to the sheet, at a first position,the plurality of tools (10, 210) 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 orthogonal to the first direction on the sheet by selectively making a plurality of tools (10, 210) contact with and release from the sheet and relatively moving the plurality of tools (10, 210) to the second direction with respect to the sheet, at a second position, the plurality of tools (10, 210) 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 orthogonal to the first direction and the second direction; and an angle adjustment motor which causes a rotation of the blade around an axis along the third direction.