A sheet supply system for supplying a sheet from a roll including a tubular core member and the sheet wound around a periphery of the core member, the sheet supply system comprising: a transportation device including: a body; an arm including a proximal section connected to the body and a distal section that is relatively displaceable with respect to the proximal section; and a transportation-side holder provided in the distal section of the arm, the transportation-side holder holding the roll; a roll mounting section on which the roll is mounted, the roll mounting section being disposed within a moving range of the transportation-side holder; a sheet supply device disposed within the moving range of the transportation-side holder, the sheet supply device including a roll supporter that supports the roll in a state where the sheet is continuously feedable; characterized in that the system further comprises an intermediate processing device disposed within the moving range of the transportation-side holder, the intermediate processing device performing intermediate processing set in advance for the roll; and a controller configured to control the transportation device, wherein the controller controls the transportation device to cause the transportation-side holder to hold the roll on the roll mounting section, and to convey the roll held by the transportation-side holder to the roll supporter of the sheet supply device through the intermediate processing device, wherein the distal section of the arm includes an attached portion to which the transportation-side holder is attached, the transportation-side holder includes a roll holding shaft extending from the attached portion, the roll holding shaft holds the roll in a state of being inserted into the core member of the roll, and the controller controls the transportation device in such a manner that the roll holding shaft is inserted into the core member of the roll on the roll mounting section, and wherein the roll holding shaft includes a proximal section fixed to the attached portion, and a distal section (44a_2) to be inserted into the core member of the roll, the intermediate processing device includes a winding direction detection device, the winding direction detection device configured to detect a winding direction of the roll, and the controller controls the transportation device in such a manner that when the winding direction of the roll detected by the winding direction detection device is a direction set in advance, the roll is conveyed to the sheet supply device. a transportation device including: a body; an arm including a proximal section connected to the body and a distal section that is relatively displaceable with respect to the proximal section; and a transportation-side holder provided in the distal section of the arm, the transportation-side holder holding the roll; a body; an arm including a proximal section connected to the body and a distal section that is relatively displaceable with respect to the proximal section; and a transportation-side holder provided in the distal section of the arm, the transportation-side holder holding the roll; a roll mounting section on which the roll is mounted, the roll mounting section being disposed within a moving range of the transportation-side holder; a sheet supply device disposed within the moving range of the transportation-side holder, the sheet supply device including a roll supporter that supports the roll in a state where the sheet is continuously feedable; characterized in that the system further comprises an intermediate processing device disposed within the moving range of the transportation-side holder, the intermediate processing device performing intermediate processing set in advance for the roll; and a controller configured to control the transportation device, wherein the controller controls the transportation device to cause the transportation-side holder to hold the roll on the roll mounting section, and to convey the roll held by the transportation-side holder to the roll supporter of the sheet supply device through the intermediate processing device, wherein the distal section of the arm includes an attached portion to which the transportation-side holder is attached, the transportation-side holder includes a roll holding shaft extending from the attached portion, the roll holding shaft holds the roll in a state of being inserted into the core member of the roll, and the controller controls the transportation device in such a manner that the roll holding shaft is inserted into the core member of the roll on the roll mounting section, and wherein the roll holding shaft includes a proximal section fixed to the attached portion, and a distal section (44a_2) to be inserted into the core member of the roll, the intermediate processing device includes a winding direction detection device, the winding direction detection device configured to detect a winding direction of the roll, and the controller controls the transportation device in such a manner that when the winding direction of the roll detected by the winding direction detection device is a direction set in advance, the roll is conveyed to the sheet supply device.