A beer maker may include a fermentation vessel accommodated in a space and having a beer brewing space, a main channel communicating with the beer brewing space, a sub-channel communicating with the beer brewing space, a gas pump connected to the sub-channel to pump gas to the sub-channel, and a gas valve at the sub-channel. Ingredients for brewing beer are supplied to the beer brewing space through the main channel, and gas is supplied to the beer brewing space through the sub-channel, so that beer can be simply brewed while minimizing a user from opening the lid.