To realize a treating device for viscous multicomponent elastomer by which individual components are accurately and uniformly determined.

In the treating device for viscous multicomponent elastomer where a pumping/quantitative analysis instrument 1, 2 is provided for each component and one of components to be treated fed to each pumping/ quantitative analysis instrument 1, 2 through a separate line 12, 22 is fed to a mixing device connected to a spray coating device 4, 6 through the other separate line 13, 14, each pumping/quantitative analysis instrument 1, 2 has an axial piston pump, and on the outlet side of the axial piston pump, a means for compensating a pressure pulse generated during stroke movement is provided.