The invention provides a manufacturing method of particles, comprising the steps: mixing raw material fluid containing a raw material, treatment fluid containing a material for treating the raw material and at least 2 kinds of treated fluids in film fluid formed between at least 2 oppositely arranged, approachable-detachable surfaces for treatment of which at least one surface can rotate relative to the other surface, thus obtaining treated raw material particles. Simultaneously, by controlling the circumferential speed of rotation in a mixing part for mixing the raw material fluid with treatment fluid, the ratio of treated raw material particles mixed together is controlled.