The possibility of performing a bending process again on an area that has already been bent once is reduced. Provided is a bending device (1) including two receiving sections (8) disposed with a distance therebetween a pressing section (9) that presses a plate-like workpiece, which is supported in a bridged manner between the receiving sections (8), into a space between the receiving sections (8) an operable section (5, 6) that applies an external force for causing the pressing section (9) to generate a pressing force and a marker retaining section (10) that is attached to at least one of the pressing section (9) and the receiving section (8) side and that retains a marker to be adhered to a pressed area of whichever one of surfaces of the workpiece by means of the pressing force.
