Yoroi-jinja, Shinto shrine in Kita-Shinjuku, Tokyo, Japan

Yoroi-jinja is a small Shinto shrine in Shinjuku with a simple wooden structure and traditional roof. The well-kept grounds contain stone lanterns, small statues, and several subsidiary shrines, including Tenjin-sha dedicated to the god of learning.

The shrine's origin is tied to Enshō-ji, a temple founded during Emperor Daigo's reign (898–929), for which a protective deity, Yoroi Daimyōjin, was likely enshrined at its northeast corner. From the early Tenryaku era (947 onward) comes the tradition that Taira no Masakado's armor was buried here. In the mid-Meiji period, Tenjin-sha was moved into the grounds as a subsidiary shrine.

The name Yoroi refers to armor and connects this place to legends of the samurai Taira no Masakado. Visitors come here to offer prayers for protection and to pay respect, showing how local traditions and ancient warrior stories remain alive in daily life today.

The shrine is easily accessible on foot from nearby train stations and sits in a lively area with shops close by. The compact grounds are easy to navigate, allowing for a quick visit, especially on weekdays when it is quieter.

The shrine's name, Yoroi, means armour: legend holds that Yamato Takeru buried six sets of armour here during his eastern campaign, and that Taira no Masakado's armour was later interred on the same ground. The shrine was formerly called Yoroi Daimyōjin. A designated Shinjuku ward cultural property, a kōshin-tō carved in the form of a komainu, stands in the grounds.