The structure is almost same with Uchigatana, but the way of carrying is totally different (Uchigatana is carried with the blade upward by putting in a belt, while Tachi is hung with the blade downward to carry), and Koshirae (fittings) are also different.
構造は打刀と殆ど同じだが、携帯方法が大きく違い（打刀は刃を上にし帯に差して携帯するのに対し、太刀は刃を下にし吊るして携帯する）、それに伴い拵（外装）も異なる。