Method for producing organic compound, and method for producing ester

[Problem] To provide a method for producing an organic compound whereby a reaction between substances can be promoted. [Solution] A method for producing an organic compound comprising: a mixing step for mixing a first liquid with a second liquid, said first liquid and second liquid being immiscible with each other; and a reaction step for irradiating a liquid mixture, which is prepared in the mixing step, with microwaves and ultrasonic waves to form an emulsion of the first and second liquids, and then reacting a first substance contained in the first liquid with a second substance contained in the second liquid.