Abstract: A washing apparatus for filter presses which is used for washing filter cloths on filter plates upon completion of filtration comprises a carriage disposed above the filter plates, a pantograph attached to the carriage, a fluid cylinder having its rod connected to the intermediate pivot of the pantograph, a washing liquid spraying pipe connected to the lower link overlap region of the pantograph and having nozzles, multiple extensible pipes disposed between the carriage and opposite sides of the pantograph attaching region of the washing liquid spraying pipe for holding the washing liquid spraying pipe horizontal, and a flexible conduit connected to the washing liquid spraying pipe and adapted to move to follow the expansion and contraction of the pantograph.