A reaction apparatus of the present invention includes a reaction chamber that contains a reaction liquid, and a liquid dispersion device provided inside the reaction chamber. The liquid dispersion device includes a rotary shaft disposed along a vertical direction, and at least one liquid flow member attached to the rotary shaft. The liquid flow member includes an ejection portion positioned above a liquid surface of the reaction liquid, a suction portion positioned below the liquid surface of the reaction liquid, and a flow path extending between the ejection portion and the suction portion and allowing the reaction liquid to flow therethrough.