To provide a stiffening plate for perforation processing for a printed board which prevents generation of a cracking of a coating film by imparting appropriate hardness to a lubrication layer of a stiffening plate, prevents a blocking phenomenon in winding when manufacturing the stiffening plate, also prevents sticking in a handling of the stiffening plate at the time of perforation processing of the printed board or the like, and is provided with a lubrication layer with excellent stability of a coating film thickness.

A lubrication layer comprising a resin composition containing (A) 30-80 wt. prts. of polyethlene glycol having an average molecular weight of 1,000 or higher to less than 15,000, (B) 10-50 wt. prts. of polyethylene glycol having an average molecular weight of 15,000 or higher to less than 50,000 and (C) 5-40 wt. prts. of polyethylene glycol having an average molecular weight of 50,000-200,000 is formed on at least one surface of a stiffening plate base material of the stiffening plate for perforation processing for the printed board or the like. Trimethylolpropane is sometimes contained in the resin composition.