A hyperthermostable protease having the amino acid sequence represented by
the SEQ ID NO:1 of the Sequence Listing or a sequence derived therefrom
by deletion, substitution, insertion or addition of one to several amino
acid residues, a gene encoding the hyperthermostable protease, and a
process for preparing the protease, aiming at providing by genetic
engineering techniques a hyperthermophile protease which is advantageous
for industrial use.