The temple was founded in 826 AD by Kobo Daishi, the founder of Shingon Buddhism.
It is traditionally ranked as one of the three great Daishi temples in the Kanto region.
The temple grounds contain a 'salt-jizo' statue, which worshippers cover in salt to pray for the healing of skin ailments.
The site hosts over 7,000 peony plants representing roughly 50 different species during its peak season.
The main hall was reconstructed after the original structure was destroyed by fire in 1966.
The temple's name 'Nishiarai' translates literally to 'West Washing', derived from a legend involving a medicinal well.
It is an official stop on the pilgrimage circuit of 88 temples associated with Kobo Daishi.
The temple complex includes a specific area dedicated to the worship of the deity Fudo Myoo, known for its fierce appearance.
Nishiarai Daishi, formally known as Soji-ji Temple, is a significant Shingon Buddhist site dedicated to Kobo Daishi. The temple is renowned for its exorcism rituals and the legendary story of Kobo Daishi creating a healing well by striking the ground with his staff. The complex grounds house a peony garden that features thousands of plants, blooming annually in late spring. Beyond the main hall, visitors can explore the Sanmon Gate and a three-story pagoda within the forested precinct. It serves as a major destination for 'Yakuyoke,' a traditional ritual performed to ward off bad luck. The architecture reflects traditional Edo-period temple styles, characterized by ornate woodwork and expansive tiled roofs. Stone lanterns and koi-filled ponds are integrated throughout the landscape, providing calm visual markers. It remains an active religious site where practitioners come daily for prayer and protective amulets.
The path leading to the Sanmon Gate, especially when the surrounding cherry or peony trees are in bloom.
Try the local specialty, Kusa-dango (mugwort rice dumplings), sold at the shops along the approach path.
Visit the temple office to purchase an Omamori, which is widely considered one of the most popular protective charms in Tokyo.
Walk the full perimeter of the garden to see the koi ponds located behind the main temple structures.
Do not take photos of the monks or private prayer ceremonies.
The temple grounds are open year-round, though specific halls may occasionally close for private memorial services or renovations.
Remove hats and remain quiet inside the temple halls; do not photograph the interior altars.
