A method of producing cadaverine is more efficient and at a higher yield than production methods by the conventional fermentation methods. The method includes culturing coryneform bacterium/bacteria having a resistance to a pH of 5.5 or less. Preferably, the coryneform bacterium/bacteria has/have lysine decarboxylase activity and, preferably, the coryneform bacterium/bacteria has/have homoserine auxotrophy and/or a resistance to S-(2-aminoethyl)-L-cysteine.