Abstract: A germicidal ceramics of an excellent germicidal ability without releasing any substance to damage health of animals and plants, a method for producing the same and a sterilizing method using the same are provided. The germicidal ceramics is produced by mixing zeolite and clamshell in a weight ratio of 90:10 to 50:50 and then pulverizing the both into particles having an average size of not more than 200 &mgr;m. Alternatively, the germicidal ceramics is produced by mixing, in a weight ratio of 90:10 to 50:50, zeolite powder and clamshell powder previously pulverized into the particles having an average size of not more than 200 &mgr;m respectively to prepare mixed powder, then compacting the mixed powder to obtain a compact which is heated at 100 to 300° C. and at 400 to 650° C. in a stepwise manner, and sintering the compact at 700 to 1050° C. The bacteria is sterilized by the germicidal ceramics immersed in a liquid in which the bacteria exist.