To provide a method/device for emulsification of dispersing which performs fine particle dispersing and fine emulsification and dispersing of fine particle-containing liquid stably.

In the method for making a liquid or solid (a) in the mixture of the liquid or solid (a) and a liquid (b) into fine particulates to emulsify or disperse them, the method/device for emulsification or dispersing allows the mixture to pass through one or more thin hole parts having inner diameters 0.1 to 5 mm characteristically. It is preferable that the device has a resistive element preventing the flow of the mixture and having a front part in a conical shape in the rear of the thin hole parts and that the inner walls of the thin hole parts have spiral grooves and recessed or projecting resistive shapes.