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Ōta is the southernmost of Tokyo's 23 special wards, on Tokyo Bay beside the Tama River in Japan, famous as the home of Haneda Airport and of the Nichiren temple Ikegami Honmon-ji. Its top sights are Ikegami Honmon-ji, Senzokuike Park, Haneda Airport, Anamori Inari Shrine and Tamagawadai Park.
The ward was formed on 15 March 1947 by merging the old wards of Ōmori and Kamata, taking one character from each name. Haneda opened as Tokyo Airfield in 1931 in a town then known for the busy shrine quarter around Anamori Inari Shrine, and land reclaimed for the airport later made Ōta the largest of Tokyo's wards by area.
Ōta covers 59.46 km² and had an estimated 744,849 people in 2024. Its western hills hold the garden suburb of Den-en-chōfu, developed by Eiichi Shibusawa's Garden City Company, while the bayside east is known for its many small factories. Ōmori, on the old Tōkaidō, was once famous for farming nori seaweed.
Ikegami Honmon-ji is the Nichiren Shū head temple in Ikegami, Ōta, Tokyo, founded where Nichiren died in 1282. Its five-storey pagoda of 1608 survived the 1945 air raids, a 96-step stone stair said to be a gift of Katō Kiyomasa climbs to it, and the O-Eshiki festival fills it each 11–13 October.
Ikegami Baien is a ward-run plum garden on a hillside just west of Ikegami Honmon-ji in Ōta, Tokyo, on the site of painter Itō Shinsui's former home and studio. About 370 white and red plum trees bloom from January to March, and two tea houses, Chōuan and Seigetsuan, stand among them.
Senzokuike Park surrounds Senzoku Pond, a spring-fed pond in Minami-senzoku, Ōta, Tokyo, where Nichiren is said to have rested and washed his feet. It is one of Tokyo's well-known cherry blossom spots, with rowing boats, the wooden Ikezuki Bridge and a Benzaiten shrine on an island.
Katsu Kaishū Memorial Museum opened on 7 September 2019 beside Senzoku Pond in Ōta, Tokyo, next to the site of Katsu Kaishū's villa Senzokuken. It shows his letters, diaries and Kanrin Maru logbook in and beside the 1928 Seimei Bunko building, and his grave stands on the pond shore.
Haneda Airport, officially Tokyo International Airport, lies on reclaimed land on Tokyo Bay in Ōta, Tokyo, 15 km south of Tokyo Station. It opened as Tokyo Airfield in 1931, now covers about 1,522 hectares, roughly a quarter of the ward, and its terminals have observation decks for plane watching.
Anamori Inari Shrine is the Inari shrine in Haneda, Ōta, Tokyo, which once stood on land now inside Haneda Airport. Dedicated to Toyoukehime, it was the heart of a popular pre-war resort quarter, and today travellers and airline staff come here to pray for safe flights and journeys.
Tokyo Port Wild Bird Park is a 36-hectare nature reserve on reclaimed land beside Ōta Market in Ōta, Tokyo, first opened in 1978 after a residents' campaign. Its freshwater, brackish and tidal ponds draw shorebirds, and 237 bird species have been recorded there since 1990.
Omori Nori Museum opened in April 2008 in Ōta, Tokyo, to keep alive Ōmori's nori seaweed farming, carried on here from the mid-Edo period until fishing rights were given up in 1962. It displays Itōmaru, the last nori boat, and a rebuilt drying shed, beside the Ōmori Furusato no Hamabe Park beach.
Tamagawadai Park runs about 600 m along a bluff above the Tama River in Den-en-chōfu, Ōta, Tokyo, and holds ten ancient burial mounds, including the large keyhole tombs Kamenokoyama and Hōraisan. Some 3,000 hydrangeas bloom in June, and Mount Fuji shows on clear winter days.
Tamagawa Sengen Shrine stands on top of an ancient burial mound in Den-en-chōfu, Ōta, Tokyo, and is said to date to the 1180s, when Hōjō Masako prayed here for Minamoto no Yoritomo. Its main hall is the only sengen-style shrine building in Tokyo, and lava stones line the approach.
Ryūshi Memorial Hall is the museum of Nihonga painter Kawabata Ryūshi in Ōta, Tokyo, founded in 1963 while he was still alive and run by the ward since 1991. It holds about 140 of his works, shown in four changing displays a year, and his old house and studio stand in Ryūshi Park opposite.
Shōwa no Kurashi Museum, a museum of Shōwa-era daily life, is a 1951 family house in Minami-kugahara, Ōta, Tokyo, opened in 1999 to show post-war everyday life. Its rooms keep the Koizumi family's furniture and tools as they were used, and the house is a Registered Tangible Cultural Property.
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