萬翠荘 (Bansuisou) is a historic French-style mansion located in Matsuyama, Ehime Prefecture, Japan. Constructed in 1922 by Count Sadakoto Hisamatsu, a notable figure with a deep appreciation for French culture, this architectural gem exemplifies the elegance of the Taisho era and served as a prominent social venue attracting aristocrats and dignitaries, including visits from the Imperial family. Recognized for its cultural significance, 万翠荘 was designated as a tangible cultural property by Ehime Prefecture in 1985 and later categorized as an Important Cultural Property in 2011.

Today, the mansion not only stands as a stunning example of early 20th-century architecture but also hosts a variety of cultural events, art exhibitions, traditional crafts, and individual showcases. Visitors can enjoy guided tours and educational activities while exploring its beautifully preserved interiors and art collections. Open from 9:00 AM to 6:00 PM, 万翠荘 provides a unique glimpse into Japan's architectural heritage, making it a must-visit destination for history and art enthusiasts alike.