Improvement of thermal comfort in a semi-outdoor space constructed with Passive Cooling Wall (PCW) composed of water-permeable perforated bricks was shown with evaluation of coolness. In the space surrounded by the PCW and outdoor shaded space, thermal elements were measured and evaluations of warmth/coolness by sitting persons were performed when the PCW was wet and dry. As the result, the improvement of thermal comfort with the wet PCW was shown. Furthermore, it was confirmed that the evaporative cooling function of the PCW contributes to the improvement of thermal comfort by the cooled air without wind and radiative cooling.