There is provided a coating solution which can efficiently take in dietary fiber at high concentration. A manufacturing method and apparatus of the coating solution are provided. According to this method, the coating solution having high viscosity can be obtained. According to this apparatus, even if the added amount is larger compared to the amount of rice, a large amount of coated rice can be continuously manufactured without causing the clogging in the flow of rice and the coating solution in the apparatus and the binding of rice. The coating solution is added at a ratio of 6.0 to 8.0% by weight to rice. The coating solution is made of a water solution of a mixture of one or more kinds of soluble dietary fiber and one or more kinds of insoluble dietary fiber. The mixture is at a ratio of one part by weight of the soluble dietary fiber and 0.5 to 2 parts by weight of the insoluble dietary fiber. The diluting ratio of the mixture and water is 7 parts by weight of the mixture and 3 parts by weight of the water.