A gas oven comprising: a body; a cooking space formed in the body; a burner provided in the cooking space; an air supply fan; an air supply flow channel which connects the cooking space with an outside of the body to supply air from the air supply fan to the cooking space; and a distribution unit (140, 340, 440) provided at an ejection portion (112, 312) of the air supply flow channel to distribute the air supplied through the air supply flow channel, wherein the distribution unit (140, 340, 440) comprises: a distribution guide portion (150, 350) which distributes the air supplied through the air supply flow channel; and a supply guide portion (170, 370) which guides the air which passes through the distribution guide portion (150, 350) to be supplied to one of the cooking space and the burner, wherein the ejection portion (112, 312) of the air supply flow channel and the distribution unit (140, 340, 440) are disposed on an inner wall which forms the cooking space therein, and characterized in that the supply guide portion (170, 370) is formed on the inner wall along the whole circumference of the distribution guide portion (150, 350) so that the distribution unit (140, 340, 440) is configured to bend a flow of the air supplied through the air supply flow channel to supply the air to the cooking space along the inner wall. a body; a cooking space formed in the body; a burner provided in the cooking space; an air supply fan; an air supply flow channel which connects the cooking space with an outside of the body to supply air from the air supply fan to the cooking space; and a distribution unit (140, 340, 440) provided at an ejection portion (112, 312) of the air supply flow channel to distribute the air supplied through the air supply flow channel, wherein the distribution unit (140, 340, 440) comprises: a distribution guide portion (150, 350) which distributes the air supplied through the air supply flow channel; and a supply guide portion (170, 370) which guides the air which passes through the distribution guide portion (150, 350) to be supplied to one of the cooking space and the burner, wherein the ejection portion (112, 312) of the air supply flow channel and the distribution unit (140, 340, 440) are disposed on an inner wall which forms the cooking space therein, and characterized in that the supply guide portion (170, 370) is formed on the inner wall along the whole circumference of the distribution guide portion (150, 350) so that the distribution unit (140, 340, 440) is configured to bend a flow of the air supplied through the air supply flow channel to supply the air to the cooking space along the inner wall. a distribution guide portion (150, 350) which distributes the air supplied through the air supply flow channel; and a supply guide portion (170, 370) which guides the air which passes through the distribution guide portion (150, 350) to be supplied to one of the cooking space and the burner, wherein the ejection portion (112, 312) of the air supply flow channel and the distribution unit (140, 340, 440) are disposed on an inner wall which forms the cooking space therein, and characterized in that the supply guide portion (170, 370) is formed on the inner wall along the whole circumference of the distribution guide portion (150, 350) so that the distribution unit (140, 340, 440) is configured to bend a flow of the air supplied through the air supply flow channel to supply the air to the cooking space along the inner wall.