| 1920 | Aug. 29 | Establishment of the Tokyo Underground Railway Company |
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| 1925 | Sep. 27 | Start of construction on the section between Asakusa and Ueno by the Tokyo Underground Railway Company |
| 1927 | Dec. 30 | Tokyo Underground Railway Company - opening of the first subway section between Asakusa and Ueno |
| 1934 | Jun. 21 | Tokyo Underground Railway Company - opening of the section between Ginza and Shimbashi |
| 1939 | Sep. 16 | Start of the through-service between Asakusa on the Tokyo Underground Railway Company Line and Shibuya on the Tokyo Rapid Railway Company Line |
| 1941 | Jul. 4 | Establishment of the Teito Rapid Transit Authority |
| 1951 | Apr. 20 | Start of construction of the Marunouchi Line section between Ikebukuro and Shinjuku |
| 1953 | Dec. 1 | Formal Determination of TRTA line names (section between Asakusa and Shibuya named the Ginza Line, section between Ikebukuro and Shinjuku named the Marunouchi Line) |
| 1954 | Jan. 20 | Opening of the section between Ikebukuro and Ochanomizu of the Marunouchi Line |
| 1959 | Mar. 15 | Opening of the Kasumigaseki to Shinjuku section of the Marunouchi Line (Completion of the section between Ikebukuro and Shinjuku of the Marunouchi Line) |
| 1960 | Mar. 1 | Establishment of the new TRTA logo ( ) |
| Apr. 10 | Starting publication of the PR magazine "Metro News" | |
| 1961 | Mar. 28 | Opening of the section between Minami-senju and Naka-okachimachi of the Hibiya Line |
| 1962 | Mar. 23 | Opening of the section between Nakano-fujimicho and Honancho section of the Ogikubo Line (Completion of the section between Shinjuku and Ogikubo of the Ogikubo Line) |
| May. 31 | Opening of the section between Kita-senju and Minami-senju and the section between Naka-okachimachi and Ningyocho of the Hibiya Line (Subway Line No. 2) Start of the through-service with the Tobu Isesaki Line (to Kita-koshigaya) |
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| 1964 | Aug. 29 | Opening of the section between Higashi-ginza and Kasumigaseki of the Hibiya Line (Completion of the section between Kita-senju and Naka-meguro of the Hibiya Line) Nishi-ginza Station on the Marunouchi Line was renamed Ginza Station |
| Dec. 23 | Opening of the section between Takadanobaba and Kudanshita section of the Tozai Line | |
| 1966 | Oct. 1 | Start of the through-service with the Tozai Line and the Chuo Line (to Ogikubo) |
| 1969 | Mar. 29 | Opening of the section between Toyocho and Nishi-funabashi of the Tozai Line (Completion of the section between Nakano and Nishi-funabashi of the Tozai Line) |
| Apr. 8 | Start of the through-service between Mitaka on the Chuo Line and Tsudanuma on the Sobu Line via the Tozai Line | |
| Dec. 20 | Opening of the section between Kita-senju and Otemachi of the Chiyoda Line TRTA's operating length exceeds 100km | |
| 1971 | Apr. 20 | Opening of the section between Ayase and Kita-senju of the Chiyoda Line Start of the through-service with the JR Joban Line (to Abiko) |
| Jul. 1 | Introduction of air conditioning at Ginza and Nihombashi Stations | |
| 1972 | Apr. 1 | Ogikubo Line was renamed the Marunouchi Line |
| 1974 | Oct. 30 | Opening of the section between Ikebukuro and Ginza-itchome of the Yurakucho Line |
| 1978 | Feb. 28 | A tornado blows a Tozai Line train traveling on a bridge over the Arakawa and Nakagawa Rivers off the tracks (two carriages overturned and one carriage derailed) |
| Mar. 31 | Opening of the section between Yoyogi-koen and Yoyogi-uehara of the Chiyoda Line (Completion of the section between Ayase and Yoyogi-uehara of the Chiyoda Line) Start of the through-service with the Odakyu Odawara Line (to Hon-atsugi) |
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| Aug. 1 | Opening of the section between Shibuya and Aoyama-itchome of the Hanzomon Line Start of the through-service with the Tokyu Shin-tamagawa Line (to Futako-tamagawaen) |
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| 1979 | Dec. 20 | Opening of the section between Ayase and Kita-ayase of the Chiyoda Line |
| 1986 | Jul. 12 | Opening of the Subway Museum |
| 1987 | Aug. 25 | Opening of the section between Wakoshi and Eidan-narimasu of the Yurakucho Line Start of the through-service with the Tobu Tojo Line (to Kawagoe-shi) |
| 1988 | Jan. 1 | Prohibition of smoking on all station premises |
| Jun. 1 | Start of air conditioning inside train cars (Hibiya, Tozai, Chiyoda, Yurakucho and Hanzomon Lines) | |
| Jun. 8 | Yurakucho Line between Shintomicho and Shin-kiba starts operations (completing the Yurakucho Line between Wakoshi and Shin-kiba Stations) | |
| Nov. 22 | The first Metro pia shop opened at Ueno Station | |
| 1991 | Nov. 29 | Opening of the section between Komagome and Akabane-iwabuchi of the Namboku Line Installation of platform screen doors at all stations on the Namboku Line |
| 1993 | Jul. 1 | Posting of female station employees (eight employees in four station blocks) |
| 1995 | Mar. 20 | "Subway Sarin Gas Attack" on the Marunouchi, Hibiya and Chiyoda Lines |
| 1996 | Mar. 26 | Introduction of the stored fare (SF) system on all lines |
| Apr. 27 | Start of the through-service with the Toyo Kosoku Line (to Toyo-katsutadai) | |
| Jul. 19 | Complete air conditioning inside train cars on all lines | |
| 1997 | Jan. 29 | Two female conductors are employed on the Ginza Line for the first time since World War II |
| 1998 | Mar. 26 | Start of the through-service with the Yurakucho Line and the Seibu Ikebukuro Line (to Hanno) |
| 1999 | Jan. 25 | License received to construct Line No. 13 between Ikebukuro and Shibuya (8.9 km) |
| 2000 | Mar. 8 | Train derailment and collision that occurred at Naka-meguro Station on the Hibiya Line |
| Sep. 26 | Opening of the section between Meguro and Tameike-sanno of the Namboku Line (Completion of the section between Meguro and Akabane-iwabuchi section of the Namboku Line) Start of the through-service with the Tokyu Meguro Line (to Musashi-kosugi) |
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| Oct. 14 | Introduction of "PASSNET" (the common pre-paid card system) | |
| 2001 | Mar. 28 | Start of the through-service with the Namboku Line and the Saitama Railway Line (to Urawa-misono) |
| 2002 | Mar. 14 | The first female driver appointed since World War II (began work on the Ginza Line) |
| Mar. 23 | Began "one-man operation" between Kita-ayase and Ayase on the Chiyoda Line | |
| Dec. 18 | The special company law was promulgated and enforced (Law 188) | |
| 2003 | Mar. 19 | Opening of the section between Suitengumae and Oshiage of the Hanzomon Line (Completion of the section between Shibuya and Oshiage of the Hanzomon Line) Start of the through-service with the Tobu Nikko Lines (to Minami-kurihashi) |
| 2004 | Apr. 1 | Birth of Tokyo Metro Co., Ltd. Establishment of the Customer Relations Center Service Managers assigned to the Ginza, Ueno, and Nihombashi Stations Trial introduction of a new sign system in Ginza and Otemachi Stations |
| Oct. 1 | Establishment of Metro Fleur Co., Ltd. | |
| Oct. 20 | Tokyo Metro begins providing wireless LAN service at its stations | |
| 2005 | Jan. 11 | Opening of "Comfort Hotel Tokyo Kiyosumi Shirakawa" – a business hotel at Kiyosumi-shirakawa |
| Dec. 2 | Opening of "Echika OMOTESANDO" at Omote-sando Station | |
| 2006 | Apr. 3 | Establishment of Metro Properties Co., Ltd. |
| Jul. 13 | Opening of "R&B Hotel Tokyo Toyocho" – a business hotel at Toyocho | |
| 2007 | Feb. 3 | Service commences on our new credit card, the Tokyo Metro To Me CARD |
| Feb. 5 | Establishment of Metro Ad Agency Co., Ltd. Establishment of Metro Rail Facilities Co., Ltd. |
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| Mar. 18 | PASMO, a rechargeable IC card, is launched and interoperability with Suica made possible | |
| May. 8 | Tokyo Metro is awarded an official "mark of approval" as a family friendly employer | |
| 2008 | Mar. 15 | Romance Car MSE express service is extended directly onto the Chiyoda Line |
| Apr. 11 | AOYAMA M's TOWER opens near Gaiemmae Station | |
| Jun. 14 | Opening of the Fukutoshin Line (Wakoshi - Shibuya) | |
| Oct. 14 | The civil engineering structures of the Ginza Line (between Asakusa Station and Shimbashi Station) are certified as "Outstanding Civil Engineering Heritage" | |
| Sep. 12 | Launch of solar energy power generation system at Kita-Ayase Station of the Chiyoda Line | |
| 2009 | Feb. 6 | The Ginza Line is certified as Heritage of Industrial Modernization (The Ginza Line and the Subway Museum’s Series 1000 train, etc) |
| Feb. 20 | New "eki chika" commercial facility "Echika fit Ueno" opens in Ueno Station | |
| Mar. 26 | Opening of "Echika Ikebukuro" at Ikebukuro Station | |
| Oct. 1 | Tokyo Metro commences the broadcast of advertisements using its  Station Vision digital signage on the platforms of six major stations on the Marunouchi Line |
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| Nov. 27 | Opening of the new Esola Ikebukuro commercial building in Ikebukuro Nishiguchi (West Exit) |
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| 2010 | Apr. 1 | Introduction of toll-free calling to the Customer Relations Center |
| 2011 | May. 24 | The Chiyoda Line Series 16000 car is awarded the Laurel Prize |
| 2012 | Mar. 1 | Service commences on our new credit card, the ANA To Me CARD PASMO (Sorachika Card) |
| Apr. 11 | The new model series 1000 train commences operations on the Ginza Line | |
| 2013 | Feb. 25 | Tokyo Metro, in partnership with Japan International Consultants for Transportation Co., wins a project to assist with strengthening the regulatory regime and organizing operations management on the urban railway in Hanoi, Vietnam |
| Mar. 5 | Tokyo Metro starts providing service updates through its official Twitter account | |
| Mar. 16 | Start of reciprocal through-service between the Fukutoshin Line and the Tokyu Toyoko and Yokohama Express Minato Mirai Lines (to Motomachi-Chukagai Station) Transferring at Kudanshita Station is streamlined Two additional stations (Iwamotocho and Akihabara) are designated as transfer points Ticket gate access is provided to users of other lines at Kasuga, Korakuen, and Ichigaya Stations |
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| Mar. 21 | Cell phones can now be used on all Tokyo Metro lines (with service to become available between Kotake-mukaihara and Senkawa Stations on the Yurakucho and Fukutoshin Lines some time in FY 2016) | |
| Mar. 23 | PASMO, the rechargeable stored ualue IC card becomes usable throughout Japan | |
| Apr. 15 | Tokyo Metro commences the broadcast of advertisements using its Metro Concaurse vision digital signage in stations | |
| May. 28 | The Ginza Lineʼs series 1000 train wins the Blue Ribbon Award | |
| 2014 | Feb. 18 | Tokyo Metro signs a Memorandum of Understanding on Friendship and Cooperation with Hanoi Metropolitan Railway Management Board, Vietnam |
| Apr. 1 | Tenth anniversary of the establishment of Tokyo Metro Co., Ltd. Tokyo Metro sets new fares to reflect the new consumption tax rate and other legal amendments (fare for the first six kilometers is 165 yen (stored-value IC card) or 170 yen (ticket)) |
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| Jun. 14 | Auxiliary station power supply starts operation at Myōden Station, elevated rails on the Tozai Line | |
| Sep. 30 | Tokyo Metro announces the establishment of the Tokyo Metro “Share the Charm” Project | |
| Nov. 5 | Tokyo Metro introduces an air-conditioning system using underground thermal energy | |
| Nov. 27 | Tokyo Metro opens a “plant factory” underneath a elevated rails on the Tozai Line | |
| Dec. 1 | Tokyo Metro launches a Wi-Fi service for overseas visitors at 143 Tokyo subway stations | |
| 2015 | Feb. 10 | Tokyo Metro sets new prices for 1-Day Open Tickets (adults: 600 yen (from 710 yen), children: 300 yen (from 360 yen)) |
| Apr. 24 | Tokyo Metro opens a Subway Pavilion at KidZania Tokyo |
History
