Kojima-dera Temple is a historic Buddhist temple belonging to the Koyasan Shingon school, located in Kankakuji, Takatori Town, Takaichi District, Nara Prefecture. The temple’s mountain name is Kojima-san, although it is also known as Hōon-san. Its principal object of worship is Dainichi Nyorai, the Cosmic Buddha. According to temple tradition, it was founded by the Buddhist monk Hōon.
With a history spanning more than a thousand years, Kojima-dera remains a quiet place of worship where visitors can experience the religious traditions and cultural heritage of the Nara region.
Kojima-dera is particularly renowned for its association with the Ryōkai Mandala, also known as the Kojima Mandala, a National Treasure dating from the middle of the Heian period (794–1185). The work consists of two complementary mandalas: the Diamond Realm Mandala and the Womb Realm Mandala. Together, they represent fundamental aspects of Buddhist cosmology and the teachings of esoteric Buddhism.
The Kojima Mandala is regarded as a masterpiece comparable to the famous Takao Mandala preserved at Jingo-ji Temple in Kyoto. The original is currently entrusted to the Nara National Museum for safekeeping.
Kojima-dera is also associated with the founding of Kiyomizu-dera Temple in Kyoto. According to tradition, the monk Enchin, who is said to have established Kiyomizu-dera, was connected with Kojima-dera. From the middle of the Heian period onward, Kojima-dera flourished as a center of the Kojima lineage of Shingon Buddhism.
This connection appears in traditional Japanese narrative literature, including the medieval collection Konjaku Monogatari-shū. The stories reflect the temple’s influence beyond the local region and its role in the development of Buddhist religious culture.
The origins of Kojima-dera are traditionally traced back to a period before or during the Nara period (710–794). According to accounts in Buddhist historical works such as the Genkō Shakusho and the Honchō Kōsō-den, the monk Hōon established a temple near the shrine of Kojima in 760, following a prayer request associated with Empress Kōken.
The shrine mentioned in these accounts is generally thought to correspond to Kojima Shrine in Shimo-Kojima, Takatori Town. Although details of the temple’s earliest history remain uncertain, these traditions connect it with the development of Buddhism in ancient Yamato Province, the historical name for much of present-day Nara Prefecture.
Another theory suggests that Kojima-dera may have originated even earlier. The Nihon Shoki, an early Japanese chronicle, records that in 644 Soga no Emishi built a temple called Hokonoki-dera on Mount Ōtannoho. Some scholars and local traditions identify this temple as a possible predecessor of Kojima-dera.
If this theory is correct, the temple’s origins would predate the more widely cited foundation date by more than a century. However, this connection remains a historical interpretation rather than a definitively established fact.
In the early Heian period, Kojima-dera developed into an important Buddhist pilgrimage site in Yamato Province, alongside Hasedera and Tsubosaka-dera. Kiyomizu-dera in Kyoto is also said to have developed from a subsidiary temple associated with Kojima-dera, illustrating the institution’s historical reach.
The temple experienced a period of decline before being revived in 983 by Shinkō, a monk associated with Kōfuku-ji Temple in Nara. During this revival, Kankaku-ji was established at the foot of the mountain, and Shinkō is traditionally credited with founding the Kojima lineage of Shingon Buddhism.
At its peak, the temple complex reportedly contained 21 subsidiary temples and occupied an extensive area stretching from present-day Takatori Town toward Asuka Village. Its influence was recognized among the religious and political elite of the time.
The diary of Fujiwara no Michinaga, a powerful court noble of the Heian period, records a visit to Kojima-dera in 1007. This account, preserved in the Midō Kanpakuki, provides a valuable indication of the temple’s standing in the capital’s aristocratic world.
Over the centuries, the institution was known by several names, including Kankaku-ji and Senju-in, before the name Kojima-dera was formally restored in modern times.
During the Muromachi period (1336–1573), Kojima-dera suffered from the upheavals of warfare and entered another period of decline. It was later revived during the Edo period under the patronage of the Honda and Uemura families, who ruled the Takatori Domain.
During this era, the temple was known as Kojima-san Senju-in. Its present main hall was rebuilt in 1848 by Ken’ō, a monk associated with Tsubosaka-dera Temple.
The temple gate is especially noteworthy because it was relocated from the Second Gate of Takatori Castle. It is a rare surviving reminder of the castle’s architecture and provides a tangible link between the temple and the region’s feudal history.
After the Meiji Restoration in 1868, the government’s anti-Buddhist movement, known as haibutsu kishaku, affected many temples throughout Japan. Kojima-dera temporarily lost its resident clergy and declined.
Local devotion helped the temple recover, and in 1903 its historical name, Kojima-dera, was officially restored. Today, it continues to preserve its religious traditions and the cultural heritage accumulated over many centuries.
The main hall, rebuilt in 1848, remains an important feature of the temple grounds. The gate relocated from Takatori Castle’s Second Gate is another significant historical structure. As one of the few surviving architectural elements associated with the castle, it offers a glimpse into the region’s samurai-era past.
The Ryōkai Mandala on Indigo-Dyed Silk, Painted in Gold and Silver is Kojima-dera’s most celebrated cultural treasure. According to tradition, Shinkō received it from Emperor Ichijō in recognition of prayers for the emperor’s recovery from illness. The artwork is now entrusted to the Nara National Museum rather than displayed permanently at the temple.
The temple is also associated with a wooden standing statue of Eleven-Headed Kannon, the Buddhist bodhisattva of compassion. Designated an Important Cultural Property, the statue demonstrates the refined sculptural techniques of the Heian period. It is currently entrusted to the Tokyo National Museum.
The nearest railway station is Tsubosakayama Station on the Kintetsu Yoshino Line. From there, visitors can continue on foot to the temple. Kojima-dera can be combined with a visit to Takatori Castle Ruins and the historic Tosa Kaidō streets for a day exploring the area’s religious heritage, castle history, and traditional townscape.
Kojima-dera offers a rewarding visit for travelers interested in Japanese Buddhism, traditional art, and medieval history. Its connections with Kyoto’s Kiyomizu-dera, the celebrated Kojima Mandala, and the former Takatori Castle gate make it more than a secluded local temple. It is a place where centuries of religious devotion and cultural exchange come together in the historic landscape of Nara Prefecture.