To solve the problems with conventional mixing methods that, for example, when two or more kinds of fine particles of a submicron order are mixed, secondary particles are liable to be formed by strong cohesive force among the particles and can hardly be returned to primary particles and hence the secondary particles are mixed as they are without being cracked; there are lumps of the secondary particles localized in the resultant mixture; and homogeneous mixing at the level of primary particles is very difficult.

This mixing method comprises supplying air to a fluidized bed 12 comprising coarse particles P to fluidize particles P and supplying different kinds of fine particles p having cohesiveness to the fluidized bed 12 to thereby mix the different kinds of fine particles p while cracking secondary particles p' formed by the cohesion of particles p in fluidized bed 12.