An object of the present invention is to provide a method for producing a product by cell culture, which makes it possible to suppress the clogging of an exhaust filter due to bubbles generated on an upper surface of a culture solution, and a cell culture device that makes it possible to suppress the clogging of an exhaust filter due to bubbles generated on an upper surface of a culture solution. According to the present invention, there is provided a method for producing a product, which includes culturing a cell using a cell culture device to produce a product from the cell, where the cell culture device includes a culture container accommodating a cell suspension containing cells and at least one or more bubble trap containers capable of accumulating bubbles, the one or more bubble trap containers being connected to an outside of the culture container.