Pseudomonas aeruginosa M-1001 produced a protease when it was grown in a medium containing shrimp and crab shell powder (SCSP) of marine wastes. An antifungal protease was purified from the culture supernatant to homology. The protease had a molecular weight of 38,000 and a pI of 5.7. The optimum pH, optimum temperature, and pH stability of the protease were pH 7, 37 °C, and pH 5–8, respectively. Antifungal activity of the protease was found when using assay based upon inhibition of spores germination and hyphal extension of the fungal Fusarium solani.