To achieve various contact angles and pressures required for an inking operation by a single blade 1.

As a blade holding plate 2 whose rigidity is higher than that of a blade 1, a plurality of blade holding plates 2 made of FRP, which are different in terms of fiber orientation direction, are formed. One blade holding plate 2 selected out of the plurality of the blade holding plates 2 is disposed on the rear side at the base end portion of the blade 1, and the near base-end portions of the blade 1 and the blade holding plate 2 are held by blade holders 3 and 4, and then, fixed. By selecting one for use, out of the blade holding plates 2, having the different rigidity resulting from the difference in terms of fiber orientation direction, the apparent rigidity of the blade 1 held by the blade holders 3 and 4 is changed when pressed against the plate surface and bent.