Not to be confused with another Japanese company with the same English name, TOA Corporation, engaged in electronics industry. The two companies are not affiliated to each other.

, or TOA Corporation is a Japanese general contractor

General contractor

A general contractor is responsible for the day-to-day oversight of a construction site, management of vendors and trades, and communication of information to involved parties throughout the course of a building project.-Description:...

 construction firm.

Originating from a construction group established in Tsurumi

Tsurumi-ku, Yokohama

is one of the 18 wards of the city of Yokohama in Kanagawa Prefecture, Japan. As of 2010, the ward had an estimated population of 270,433 and a density of 8,140 persons per km²...

, Yokohama

Yokohama

is the capital city of Kanagawa Prefecture and the second largest city in Japan by population after Tokyo and most populous municipality of Japan. It lies on Tokyo Bay, south of Tokyo, in the Kantō region of the main island of Honshu...

 in 1908, the company was first incorporated in 1920 as Tokyo Bay Marine Works Co., Ltd, and was renamed to its present name in 1973.
Tōa wa one of the companies of the former Asano zaibatsu

Asano zaibatsu

Asano zaibatsu was one of the major second tier zaibatsu in Japan, formed in 1887 with the support from Shibusawa Eiichi, the founder of the Shibusawa zaibatsu and "Father of Japanese capitalism"...

.

TOA Corporation is one of the five major coastal, marine, harbor related construction companies of Japan.

Yokohama's Osanbashi Pier

Osanbashi Pier

is the main international pier at the Port of Yokohama, located in Naka Ward, Yokohama, Japan. Ōsanbashi is the oldest pier in Yokohama, originally constructed between 1889 and 1896.To meet modern demands, Ōsanbashi was reconstructed between 1987 and 2002...

, Kurushima-Kaikyō Bridge

Kurushima-Kaikyo Bridge

The , which connects the island of Ōshima to the main part of Shikoku, is the world's longest suspension bridge structure and was completed in 1999. The bridge is part of the Shimanami Kaidō, an expressway that spans a series of islands and connects Hiroshima Prefecture in Honshū to Ehime...

, Rainbow Bridge (Tokyo)

Rainbow Bridge (Tokyo)

The is a suspension bridge crossing northern Tokyo Bay between Shibaura Pier and the Odaiba waterfront development in Minato, Tokyo, Japan.Construction started in 1987 and was completed in 1993. The bridge is long with a main span of . Officially called the "Shuto Expressway No...

, Niigata Bay Tunnel, and Lagunasia

Lagunasia

is an amusement park in Gamagōri, Aichi Japan. It is home to the Aqua Wind, Pirates' Blast and Stellar roller coasters. The park was also the first Magiquest live role playing game location outside of the United States.Lagunasia was opened on April 25, 2002...

are among the works Tōa was involved in.