PURPOSE: To carry out the photoengraving work efficiently and provide an engraving film of high quality by preventing fur generated in the water during the washing of an automatic development machine for photoengraving or the like, omitting the periodical washings of a film feed roller and the like and eliminating completely the soil on the surface of a film and the like.

CONSTITUTION: A sterilization component 2 with copper surface is inserted into a cover container 1 provided with a water outlet section 4 and a stopper 5 provided with a water inlet section 3 is fixed on one end of the cover container 1 in a water sterilization device for washing an automatic development machine.