To provide a screen plate that can dissociate hardly disintegration paper with low power and with good yield when the hardly disintegration paper is solved, since the used paper as a raw material is wide various and the hardly disintegration paper which is hard to be solved is increased.

A screen plate comprises a plurality of protruded portions 21 and groove portions 22 provided through all plate surface and a corner of the protruded portion 21 is formed in an edge shape and an eye hole 23 is provided in a bottom of the groove portion 22. Preferably,the protruded portion 21 is formed such that a blade moving along with the surface and the protruded portion 21 are crossed at all positions. Preferably, the protruded portion 21 and the groove portion 22 are formed in a linear shape with each other.