西大井

Nishi-Oi Station

日本語で読む

Nishi Oi is a railway station in Tokyo.

Nishi-Ōi Station (西大井駅) in Shinagawa, Tokyo, is run by East Japan Railway Company and serves the Saikyō Line, Yokosuka Line and Shōnan–Shinjuku Line. It opened on 2 April 1986 for passengers only.

History

The Hinzuru Line (品鶴線) opened in 1929. In 1969 the national railways proposed making it a passenger line for Shinagawa Ward. In 1972 a group of Tokyo members of parliament from several parties asked the railways and the Transport Ministry to meet five conditions for a station. In 1973 Shinagawa Ward said it would oppose the plan unless three earlier conditions were met: a station paid for by the railways, a fix for a crossing that was often blocked, and noise measures. In 1975 the railways proposed a station paid for by local government, the ward assembly passed new conditions, and the ward and the railways signed a memorandum.

In 1978 residents filed a lawsuit arguing that using public money to build the station was illegal. On 12 February 1980 the ward assembly passed a resolution against opening in October 1980. On 10 June 1980 the court ruled for the plaintiffs and stopped the ward from paying public money. On 1 October 1980 the national railways made the Hinzuru Line a passenger line (SM分離).

A third-sector body began building the station in 1984. The station opened on 2 April 1986 for passengers only.

JR East took over on 1 April 1987. Automatic ticket gates came into use on 20 July 1991. Suica became usable on 18 November 2001. The Shōnan–Shinjuku Line began running on 1 December 2001.

A reserved-seat ticket machine was installed on 19 February 2007, and the Midori window closed on 12 March 2007. On 30 November 2019 Sōtetsu through trains began to stop here. For the first time at this station, a women-only car was set on weekday morning trains to Shinjuku. Eki-Net Q Ticket started on 1 October 2025.

See all 20 dated events in the Data view →

Written by an AI from this station's own sourced facts (the dated events in the Data view), nothing else, and checked by a program for dates and numbers that are not in those facts. It can still be wrong. Found a mistake? . Adapted from Japanese Wikipedia, CC BY-SA 4.0; this text is shared under the same licence.

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About this station

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Station History & Timeline
20 Events
1929

The Tokyu Toyoko Line and the Teito Rapid Transit Authority's Shinjuku Line were connected, establishing the Tokyu Shinjuku Line and the Ginza Line's through service, and the Tokyu Toyoko Line was renamed to the Toyoko Line, with the section from Shibuya Station to Shinjuku Station being renamed to the Shinjuku Line, however a more accurate translation is: The Tokyu Toyoko Line was connected to the Teito Rapid Transit Authority's Shinjuku Line, establishing through service, and the Tokyu Toyoko Line was renamed, with the section from Shibuya to Shinjuku being renamed the Shinjuku Line, but the most concise translation is: The Tokyu Toyoko Line was connected to the Teito Rapid Transit Authority's Shinjuku Line.

Machine translation — show Japanese original

品鶴線開設。

1969

Japanese National Railways (JNR) presented a plan to the Shinagawa Ward to electrify the Tamachi-Shinbashi section of the Tokaido Line for passenger service on the Tamatsu Line.

Machine translation — show Japanese original

日本国有鉄道（国鉄）が品川区に対して、品鶴線旅客化案を提示。

1972

Five members of the House of Representatives elected from Tokyo's 2nd district, from across party lines, submitted to the Ministry of Transport and Japanese National Railways a proposal for the electrification of the Tamatsu Line for passenger service, including the installation of Nishi-Oi Station, under five conditions.

Machine translation — show Japanese original

東京都第2区選出衆議院議員（5人、超党派）らが、西大井駅設置等の品鶴線旅客化5条件を運輸省および国鉄に申し入れ。

1973

The Shinagawa Ward presented Japanese National Railways with the three old conditions, including station construction at JNR's expense, measures against level crossings that were often closed, and noise countermeasures, and stated its opposition to the passenger service on the Shinagawa- Tsurumi Line unless these conditions were met.

Machine translation — show Japanese original

品川区は国鉄に、国鉄負担による駅建設、開かずの踏切対策、騒音対策（旧3条件）を提示し、3条件が実現されない限り品鶴線旅客化に反対する旨を申し入れ。

1975

The Japanese National Railways presented a plan to Shinagawa Ward for constructing a station with local burden, and the Shinagawa Ward Council approved the construction of the station with local burden and other conditions, after which Shinagawa Ward and the Japanese National Railways concluded a memorandum.

Machine translation — show Japanese original

国鉄が品川区に、地元負担による駅建設案を提示。品川区議会が地元負担による駅建設等（新3条件）を可決。品川区と国鉄が覚書を締結。

1978

A lawsuit was filed to prohibit the expenditure of residents' funds for the construction of Nishi-Oi Station on the new Yokosuka Line, deeming the investment of public funds by Shinagawa Ward as illegal.

Machine translation — show Japanese original

駅建設費に品川区の公金投入を違法とする「新横須賀線西大井駅建設費支出禁止住民訴訟」提起。

1980 2月12日

The Shinagawa Ward Council passed a resolution in October opposing the opening.

Machine translation — show Japanese original

品川区議会が10月開業反対決議。

1980 6月10日

The court ruled in favor of the plaintiffs in the residents' lawsuit, ordering an injunction against the use of public funds by Shinagawa Ward.

Machine translation — show Japanese original

住民訴訟で原告勝訴（品川区の公金支出差止）判決。

1980 10月1日

Japanese National Railways implemented the passengerization of the Tsurumi Line (separation from freight).

Machine translation — show Japanese original

国鉄は品鶴線旅客化（SM分離）を実施。

1984

Construction of the station by the third sector began.

Machine translation — show Japanese original

第三セクターによる駅建設開始。

1986

On the same day, the Yamanokoshi branch line of the Yokosuka Line began operating temporary trains between Shinjuku Station and Zushi Station.

Machine translation — show Japanese original

同日、横須賀線の蛇窪支線は新宿駅 - 逗子駅間で臨時列車の運行を開始。

1986 4月2日

Nishi-Oi Station opened (for passenger operations only).

Machine translation — show Japanese original

西大井駅開業（旅客営業のみ）。

1987 4月1日

With the privatization of Japanese National Railways, it became a station of East Japan Railway Company (JR East).

Machine translation — show Japanese original

国鉄分割民営化に伴い、東日本旅客鉄道（JR東日本）の駅となる。

1991 7月20日

Automatic ticket gates were installed and began operation.

Machine translation — show Japanese original

自動改札機を設置し、使用開始。

2001 11月18日

The IC card "Suica" becomes available for use.

Machine translation — show Japanese original

ICカード「Suica」の利用が可能となる。

2001 12月1日

The Shonan-Shinjuku Line began operation.

Machine translation — show Japanese original

湘南新宿ライン運行開始。

2007 2月19日

Reserved seat ticket vending machines were installed.

Machine translation — show Japanese original

指定席券売機設置。

2007 3月12日

The Midori no Madoguchi service ended operations.

Machine translation — show Japanese original

みどりの窓口の営業を終了。

2019 11月30日

In 2019, the Sotetsu Line direct train service began operation and the station became a stop, with the first women-only car being introduced on weekday morning trains bound for Shinjuku.

Machine translation — show Japanese original

（令和元年）：相鉄線直通列車が運行開始し、停車駅となる。平日朝の新宿方面行きで、当駅で初めて女性専用車が設定される。

2025 10月1日

The Ekinet Q-Chike service was started.

Machine translation — show Japanese original

えきねっとQチケのサービスを開始。

Timeline adapted from Japanese Wikipedia, available under CC BY-SA 4.0.

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Getting around

Platforms, transfers and navigation
Platform Layout & Transfers
PLATFORM LAYOUT (SAIKYŌ LINE)
2 Up
新宿 · 武蔵浦和 · 大宮
↕ Platform 2 serves this line
PLATFORM LAYOUT (SHŌNAN–SHINJUKU LINE)
2 Up
新宿 · 大宮 · 宇都宮
↕ Platform 2 serves this line
PLATFORM LAYOUT (YOKOSUKA LINE)
1 Down
横浜 · 逗子 · 久里浜
↕ Platform 1 serves this line
Along the line

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Nishi-Oi Station FAQ

What train lines connect at Nishi-Oi Station?

Nishi-Oi Station is served by Saikyō Line, Shōnan–Shinjuku Line, Yokosuka Line.