PROBLEM TO BE SOLVED: To provide safe oyster having a small risk of causing norovirus food poisoning while inhibiting lowering of deliciousness/texture/appearance of oyster.SOLUTION: A method for producing steamed shellfish by steaming bivalve shucked shellfish includes a step of steaming the bivalve shucked shellfish, using steam at a temperature of not less than 100°C and a pressure of not more than 1 kgf/cmG.