To enhance stirring and mixing efficiency and the efficiency of synthetic reaction by a stirring type mixer.

In a stirring and mixing apparatus equipped with a container 1 having an inflow port 4 and an outflow port 5 to permit a substance to be stirred and mixed to flow, the stirrer 3 arranged in the container 1 and consisting of the drive shaft 11 connected to a vibration source and the stirring elements 3a attached to the drive shaft and the partition plates 6 partitioning the container 1 in a multistage fashion and having fluid flowing holes 6a, at least one injection port 10 is provided to the mixing chamber 9 partitioned by the partition plates 6.