A yorishiro (依り代・依代・憑り代・憑代?) in Shinto terminology is an object capable of attracting spirits called kami, thus giving them a physical space to occupy  during religious ceremonies. Yorishiro are used during ceremonies to call the kami for worship. The word itself literally means approach substitute. Once a yorishiro actually houses a kami, it is called a shintai. Ropes called shimenawa decorated with paper streamers called shide often surround yorishiro to make their sacredness manifest. Persons can play the same role as a yorishiro, and in that case are called yorimashi (憑坐 lit. possessed person?) or kamigakari (神懸り・神憑 lit. kami possession?).
The concept and the use of yorishiro are not exclusive to Japan, but arise spontaneously in animistic cultures. In monotheistic religions animals and objects are just works of the world's creator, whereas to animists they are the natural residence of spirits, kami in the case of Japan.
Yorishiro and their history are intimately connected with the birth of Shinto shrines. Early Japanese did not have the notion of anthropomorphic deities, and felt the presence of spirits in nature and its phenomena. Mountains, forests, rain, wind, lightning and sometimes animals were thought to be charged with spiritual power, and the material manifestations of this power were worshiped as kami, entities closer in their essence to Polynesian mana than to a Western God. Village councils sought the advice of kami and developed the yorishiro, tools that attracted kami acting like a lightning rod. Yorishiro were conceived to attract the kami and then give them a physical space to occupy to make them accessible to human beings for ceremonies, which is still their purpose today. Village council sessions were held in a quiet spot in the mountains or in a forest near a great tree, rock or other natural object that served as a yorishiro. These sacred places and their yorishiro gradually evolved into the shrines of today. The very first buildings at shrines were certainly just huts built to house some yorishiro.
A trace of this origin can be found in the term hokura (神庫?), literally meaning "deity storehouse", which evolved into hokora (also written with the character 神庫), one of the earliest words for a shrine. Most of the sacred objects we find today in shrines (trees, mirrors, swords, magatama stones) were originally yorishiro, and only later became kami themselves by association.
The most common yorishiro are swords, mirrors, ritual staffs decorated with paper streamers called gohei, comma-shaped jewels called magatama (勾玉 or 曲玉?), large rocks (iwasaka (岩境?) or iwakura (磐座?), and sacred trees. Kami dwell often in unusually shaped rocks or trees, or in caves and earth mounds. Yorishiro can also be persons, and in that case they are called yorimashi (憑坐?).
Because of Shinto's nature, yorishiro are often natural objects like trees. Significantly, the characters for Shinto shrine (神社, 社 and 杜縄?) can all be read, besides jinja and yashiro, also "mori" ("tree grove"). This reading reflects the fact that the first shrines were simply sacred groves or forests where kami were present. Many shrines still have on their grounds on one of the original great yorishiro, a great tree surrounded by a sacred rope called shimenawa (標縄・注連縄・七五三縄?). Now such trees have become divine by association, and no longer simply represent a kami.
Shinto altars called himorogi are usually just square areas demarcated with green bamboo or sakaki at the corners supporting sacred border ropes (shimenawa). A branch of sakaki at the center is erected as a yorishiro.
Rock cults are also common. An iwakura is simply a rock formation where a kami is invited to descend, and is therefore holy ground. With time, through a process of association, the iwakura itself can come to be considered divine. Archeological research in Japan confirms these cults to be ancient. In shrines, even today stones considered to be related to the shrine's kami are used to make food offerings to the kami.
Yorishiro in homes
Yorishiro are, however, most numerous in people's homes. During the New Year's holidays people decorate their entrances with kadomatsu, which are the yorishiro of the new year's kami. Kamifuda, pieces of paper representing the kami, are hung above the door. There are kami who dwell in the toilet (benjō-gami) and in the well (suijin). The kamado-gami lives in the oven, and its function is to protect the house from fires. Other common yorishiro are the small altar called kamidana and the butsudan, which is an altar for the dead. (Butsudan were originally meant just for Buddhist worship, but now often contain also memorial tablets called "ihai", which are yorishiro used to recall the spirits of one's dead ancestors). In shops one often sees clay cats with a raised paw called manekineko or rake-like bamboo objects called kumade supposed to attract good business.
- Nakamaki, Hirochika (1985-10-01). "The "Separate" Coexistence of Kami and Hotoke - A Look at Yorishiro". Retrieved 2008-10-22.
- Okada, Yoshiyuki (2005-06-02). "Yorishiro". Encyclopedia of Shinto. Retrieved 2008-07-18.
- Sugiyama, Shigetsugu (2005-06-02). "Iwakura". Encyclopedia of Shinto. Retrieved 2008-07-18.
- Sugiyama, Shigetsugu (2005-06-02). "Iwasaka". Encyclopedia of Shinto. Retrieved 2008-07-18.
- Sugiyama, Shigetsugu. "Himorogi". Encyclopedia of Shinto. Retrieved 2008-07-18.
- Tamura, Yoshiro (2000). Japanese Buddhism - A Cultural History (First ed.). Tokyo: Kosei Publishing Company. p. 21. ISBN 4-333-01684-3.