To obtain a platelike protector by which a wire material can be wired in a curve shape in a narrow space in a state that the wire material is held in a plane shape and by which the wire material can be cut easily, by a method wherein a slit which is formed at least one side of a flat board is extended to one end part from the other end part of the flat board.

One end part of a plate 12 and one end part of a plate 13 are connected by a connecting board 14. When a plurality of wires are inserted into a part between the plates 12, 13 from the other end part, the wires can be held in a plane shape. In addition, a plurality of slits 15 are formed on the plate 12, they are extended up to the other end part from one end part of the plate 12, and they are separated at set intervals in the extension direction of the plate 12. As a result, a protector 11 can be easily. In a state that the wires are held in the plance shape, the wires can be wired in a curve shape in a narrow space. In addition, when the plate 13 is cut through the slits 15, the protector 11 can be cut easily, and its length can be changed easily.