The Iwamizawa Hyakumochi Festival is a traditional autumn festival held every September in Iwamizawa, Hokkaido. This festival has been loved by local residents for many years as a local event to pray for bountiful harvests and long life. Iwamizawa is located in the center of Hokkaido, an area rich in agriculture and nature, and the purpose of the festival is to celebrate a life in harmony with the local nature. What makes this festival unique is that it goes beyond being just a local festival and attracts many tourists. The biggest attraction, the mochi pounding, uses one of the world's largest mortars, with a diameter of 2.2 meters and a weight of 5.5 tons, and the impressive sight cannot be seen at any other festival. The mochi pounding using this giant mortar is a performance that combines strength and delicacy, and the audience is overwhelmed. In addition, this festival has a wide range of events for a wide range of ages, from children to the elderly, and one of its attractions is the sense of community and warmth. The fact that freshly pounded mochi is served free of charge is also a reason why many people visit. In this way, the Iwamizawa Hyakumochi Festival is a major event that conveys the charm of local culture and allows visitors to experience the seasonal scenery of autumn in Hokkaido.