An electroconductive plate is prepared by molding an electroconductive
resin composition comprising an electroconductive agent and a
radical-polymerizable thermosetting resin system having an acid value in
a specific range by a resin molding method. The electroconductive agent
may be a carbon powder. The radical-polymerizable thermosetting resin
system may comprise a radical-polymerizable resin and a
radical-polymerizable diluent. The double bond equivalent of the
radical-polymerizable resin is preferably about 200 to 1000. The glass
transition temperature of the hardened product is preferably not lower
than 120.degree. C. The proportion (weight ratio) of the
electroconductive agent relative to the radical-polymerizable
thermosetting resin system [the former/the latter] is about 55/45 to
95/5.