EMULSIFIER, EMULSIFIED COMPOSITION AND METHOD FOR PREPARING THE COMPOSITION

PROBLEM TO BE SOLVED: To provide an emulsifier which is capable of rapidly performing efficient stirring and mixing in a short time with small driving power and a method for preparing emulsified matter by using the emulsifier and an emulsified composition obtained by using the emulsifier. SOLUTION: A mixing chamber 10 has a concentric housing cylindrical cross section 11 having a flow passage cross-sectional area of >=2 times the flow passage cross-sectional area of a confluent path 1. A collision disk 12 which is larger in its diameter than the inner diameter of the confluent path and has an edge 13 projecting toward an upstream side on a peripheral marginal area is concentrically fixed into the cylindrical cross section. Both of the flow passage cross-sectional area constituted of a spacing between the outer peripheral surface at the edge of the collision disk 12 and the inner peripheral surface of the housing cylindrical cross section and the flow passage cross-sectional area constituted of a spacing between the downstream side flank of the collision disk and the downstream side end face of the housing cylindrical cross section are so set as to be approximately equal to the flow passage cross-sectional area of the confluent path.