In order to improve the performance of polymer electrolyte fuel cell (PEFC), management of liquid water generated by cell operation is an important issue. The water generated in the catalyst layer is transported to the channel through the microporous layer (MPL) and gas diffusion layer (GDL). It has been suggested that water condenses and accumulates at the interface between the MPL and the catalyst layer. Since the condensed water accumulated at the interface inhibits oxygen transport, clarification of the water distribution and its behavior is required to improve the cell performance. In this study, we developed a new device for visualizing the water that condenses at the interface, and observed the distribution of the condensed water. In order to observe the condensed water at the interface, a transparent water vapor permeable membrane that mimics the catalyst layer was used. Water vapor was condensed by imposing a temperature gradient inside the cell with cooling the anode-side separator. As a result of the experiment, condensed water generated at the interface was successfully visualized. In the future, condensed water will be observed under the same settings as the actual cell operating conditions. Improvement of the internal structure of the cell and adequate control of the temperature gradient will be effective solutions.