A culture apparatus comprising: a fan configured to circulate air inside a culture chamber in a predetermined direction in the culture chamber; a duct configured to guide air circulating inside the culture chamber along a wall face inside the culture chamber from an upper part to a lower part of the culture chamber; and a gas generator detachable from a predetermined position at a lower part of the duct, the gas generator being configured to take in air discharged from a lower part of the duct and discharge together with the air taken in a hydrogen peroxide gas to sterilize the inside of the culture chamber generated from a hydrogen peroxide solution into the culture chamber.