Dispersing device and stacking device

The invention provides a dispersing device and a stacking device capable of well dispersing materials. The dispersion device is characterized by being provided with: a supply unit having a supply pipe for supplying a material containing fibers together with air, and a chamber; the chamber has a first swirling flow forming part that forms a first swirling flow of air containing the material, and a second swirling flow forming part that communicates with the first swirling flow forming part and forms a second swirling flow of air containing the material in the opposite direction to the first swirling flow. The cavity is connected with the supply pipe; a dispersion unit having a housing in which a discharge port through which the material is discharged is formed, the dispersion unit stirring the material within the housing, discharging the material from the discharge port into a gas, and dispersing the material; and a connecting part having a communication port for communicating the first swirling flow forming p