In this study, we attempt to promote fermentation using a device that simulates intestinal peristalsis. Fermentation by beneficial bacteria maintains the intestinal environment. Moreover, there is a possibility that the acceleration of fermentation is related to intestinal movements such as peristalsis. Therefore, we aim to elucidate the relationship between fermentation and peristalsis, and further promote fermentation using a device that simulates peristalsis. In this paper, as an initial study, we used the device to confirm the progress of fermentation using a substance with a large viscosity. The results revealed that, the higher the viscosity, the more stable the degree of mixing and the greater the progression of fermentation.