Japan competed at the 1984 Summer Olympics in Los Angeles, United States. Japan returned to the Games after participating in the American-led boycott of the 1980 Summer Olympics. 226 competitors, 174 men and 52 women, took part in 147 events in 22 sports.
Kōji Gushiken — Gymnastics, Men's All-Around Individual CompetitionKōji Gushiken — Gymnastics, Men's RingsShinji Morisue — Gymnastics, Men's Horizontal BarShinji Hosokawa — Judo, Men's Extra Lightweight (60 kg)Yoshiyuki Matsuoka — Judo, Men's Half Lightweight (65 kg)Hitoshi Saito — Judo, Men's HeavyweightYasuhiro Yamashita — Judo, Men's Open ClassTakeo Kamachi — Shooting, Men's Rapid-Fire PistolAtsuji Miyahara — Wrestling, Men's Greco-Roman FlyweightHideaki Tomiyama — Wrestling, Men's Freestyle Bantamweight (57 kg)Noboyuki Kajitani — Gymnastics, Men's Parallel BarsMasaki Eto — Wrestling, Men's Greco-Roman BantamweightTakashi Irie — Wrestling, Men's Freestyle Light Flyweight (48 kg)Kosei Akaishi — Wrestling, Men's Freestyle Featherweight (62 kg)Hideyuki Nagashima — Wrestling, Men's Freestyle Middleweight (82 kg)Akira Ota — Wrestling, Men's Freestyle Light Heavyweight (90 kg)Hiroshi Yamamoto — Archery, Men's Individual CompetitionTsutomu Sakamoto — Cycling, Men's 1.000m Sprint (Scratch)Yumi Egami, Norie Hiro, Miyoko Hirose, Kyoko Ishida, Yoko Kagabu, Yuko Mitsuya, Keiko Miyajima, Kimie Morita, Kumi Nakada, Emiko Odaka, Sachiko Otani, and Kayoko Sugiyama — Volleyball, Women's Team CompetitionKōji Gushiken — Gymnastics, Men's Horizontal BarKoji Sotomura — Gymnastics, Men's Floor ExercisesKōji Gushiken, Noritoshi Hirata, Noboyuki Kajitani, Shinji Morisue, Koji Sotomura, and Kyoji Yamawaki — Gymnastics, Men's Team Combined ExercisesSeiki Nose — Judo, Men's Middleweight (86 kg)Miwako Motoyoshi — Synchronised Swimming, Women's SoloSaeko Kimura and Miwako Motoyoshi — Synchronised Swimming, Women's DuetKazushito Manabe — Weightlifting, Men's Flyweight (52 kg)Masahiro Kotaka — Weightlifting, Men's Bantamweight (56 kg)Ryoji Isaoka — Weightlifting, Men's Light Heavyweight (82½ kg)Ikuzo Saito — Wrestling, Men's Greco-Roman Light FlyweightYuji Takada — Wrestling, Men's Freestyle Flyweight (52 kg)In their third Olympic archery competition, Japan won a bronze medal in the men's division as well as having a fourth place competitor in each division.
Women's Individual Competition:
Hiroko Ishizu – 2525 points (4th place)Minako Hokari – 2481 points (10th place)Men's Individual Competition:
Hiroshi Yamamoto – 2563 points (Bronze Medal)Takayoshi Matsushita – 2552 points (4th place)Ichiro Shimamura – 2312 points (52nd place)Men's 400 metres
Susumu TakanaHeat — 46.26Quarterfinals — 45.91Semifinals — 45.88 (→ did not advance)Men's 10,000 metres
Yutaka KanaiQualifying Heat — 28:14.67Final — 28:27.06 (→ 7th place)Masanari ShintakuQualifying Heat — 28:24.30Final — 28:55.54 (→ 16th place)Men's Marathon
Takeshi SoFinal — 2:10:55 (→ 4th place)Toshihiko SekoFinal — 2:14:13 (→ 14th place)Shigeru SoFinal — 2:14:38 (→ 17th place)Men's Long Jump
Junichi UsuiQualification — 8.02mFinal — 7.87m (→ 7th place)Men's High Jump
Takao SakamotoQualification — 2.21m (→ did not advance)Men's Javelin Throw
Masami YoshidaQualification — 81.42mFinal — 81.98m (→ 5th place)Kazuhiro MizoguchiQualification — 74.82m (→ did not advance, 20th place)Men's Hammer Throw
Shigenobu MurofushiQualification — 70.92m (→ did not advance)Men's Pole Vault
Tomomi TakahashiQualifying Round — 5.30mFinal — no mark (→ no ranking)Women's Marathon
Nanae SasakiFinal — 2:37:04 (→ 19th place)Akemi MasudaFinal — did not finish (→ no ranking)Women's High Jump
Hisayo FukumitsuQualification — 1.87m (→ did not advance, 17th place)Megumi SatoQualification — 1.84m (→ did not advance, 18th place)Women's Javelin Throw
Emi MatsuiQualification — 57.72m (→ did not advance)Minori MoriQualification — 56.60m (→ did not advance)Men's Light Flyweight (– 48 kg)
Mamoru Kuroiwa- First Round — Bye
- Second Round — Defeated Francisco Tejedor (COL), 4:1
- Quarterfinals — Lost to Keith Mwila (KEN), 0:5
Men's Bantamweight (– 54 kg)
Hiroaki Takami- First Round — Bye
- Second Round — Defeated Gamaleldin El-Koumy (EGY), 4:1
- Third Round — Lost to Dale Walters (CAN), 0:5
Nine cyclists, eight men and one woman, represented Japan in 1984. Tsutomu Sakamoto won a bronze medal in the sprint event.
Men's individual road raceMatsuyoshi Takahashi — 45th placeSprintTsutomu SakamotoKatsuo Nakatake1000m time trialTsutomu SakamotoTeam pursuitAkio KuwazawaHarumitsu OkadaMitsugi SarudateYoshihiro TsumurayaPoints raceAkio KuwazawaHitoshi SatoWomen's individual road raceWakako Abe — 40th placeMen's 3m Springboard
Isao YamagishiPreliminary Round — 427.14 (→ did not advance, 25th place)Nine fencers, five men and four women, represented Japan in 1984.
Men's foilKenichi UmezawaNobuyuki AzumaTadashi ShimokawaMen's team foilNobuyuki Azuma, Yoshihiko Kanatsu, Hidehachi Koyasu, Tadashi Shimokawa, Kenichi UmezawaWomen's foilAzusa OikawaMieko MiyaharaMiyuki MaekawaWomen's team foilMieko Miyahara, Azusa Oikawa, Miyuki Maekawa, Tomoko OkaHandball
Men's Team CompetitionPreliminary Round (Group A)Lost to Yugoslavia (15:32)Lost to Romania (22:28)Lost to Iceland (17:21)Lost to Switzerland (13:20)Defeated Algeria (17:16)Classification Match9th/10th place: Lost to United States (16:24) → 10th placeTeam RosterSeimei GamoTakashi IkenoueYasou IkonaHidetada ItoKoji MatsuiMitsuaki NakamotoKiyoshi NishiyamaTakahiro OhataNobuo SasakiKenzo SekiYoshihiro ShigaKatsutoshi TaguchiSeiichi TakamuraYukihiko UemuraShinji YamamotoThree male pentathletes represented Japan in 1984.
IndividualShoji UchidaHiroyuki KawazoeDaizou ArakiTeamShoji UchidaHiroyuki KawazoeDaizou ArakiMen's 100m Freestyle
Shigeo OgataHeat — 52.96 (→ did not advance, 33rd place)Satoshi SumidaHeat — 53.83 (→ did not advance, 39th place)Men's 200m Freestyle
Hiroshi SakamotoHeat — 1:54.71 (→ did not advance, 26th place)Shigeo OgataHeat — 1:55.97 (→ did not advance, 33rd place)Men's 400m Freestyle
Shigeo OgataHeat — 4:02.97 (→ did not advance, 22nd place)Keisuke OkunoHeat — 4:06.31 (→ did not advance, 27th place)Men's 100m Backstroke
Daichi SuzukiHeat — 58.37B-Final — 58.30 (→ 11th place)Men's 200m Backstroke
Daichi SuzukiHeat — 2:06.24B-Final — 2:06.02 (→ 16th place)Men's 100m Breaststroke
Shigehiro TakahashiHeat — 1:04.71B-Final — 1:04.41 (→ 10th place)Kenji WatanabeHeat — 1:06.10 (→ did not advance, 9th place)Men's 200m Breaststroke
Shigehiro TakahashiHeat — 2:19.98B-Final — 2:20.93 (→ 12th place)Kenji WatanabeHeat — 2:22.33B-Final — 2:22.29 (→ 15th place)Men's 100m Butterfly
Taihei SakaHeat — 56.40 (→ did not advance, 21st place)Shudo KawawaHeat — 56.52 (→ did not advance, 23rd place)Men's 200m Butterfly
Taihei SakaHeat — 2:00.66B-Final — 2:00.31 (→ 9th place)Shudo KawawaHeat — 2:03.07 (→ did not advance, 18th place)Men's 200m Individual Medley
Shinji ItoHeat — 2:07.76B-Final — 2:06.07 (→ 10th place)Men's 400m Individual Medley
Shinji ItoHeat — 4:30.52B-Final — 4:29.76 (→ 13th place)Men's 4 × 100 m Freestyle Relay
Hiroshi Sakamoto, Shigeo Ogata, Taihei Saka, and Satoshi SumidaHeat — 3:30.45 (→ did not advance, 13th place)Men's 4 × 200 m Freestyle Relay
Taihei Saka, Hiroshi Sakamoto, Keisuke Okuno, and Shigeo OgataHeat — DSQ (→ did not advance, no ranking)Men's 4 × 100 m Medley Relay
Daichi Suzuki, Shigehiro Takahashi, Taihei Saka, and Hiroshi SakamotoHeat — 3:50.14Final — DSQ (→ no ranking)
Women's 100m Freestyle
Kaori YanaseHeat — 58.47 (→ did not advance, 17th place)Chikako NakamoriHeat — 59.00 (→ did not advance, 21st place)Women's 200m Freestyle
Chikako NakamoriHeat — 2:03.94B-Final — 2:04.11 (→ 13th place)Kaori YanaseHeat — 2:04.38B-Final — 2:05.24 (→ 16th place)Women's 400m Freestyle
Chikako NakamoriHeat — 4:20.13B-Final — 4:20.18 (→ 14th place)Junko SakuraiHeat — 4:28.68 (→ did not advance, 19th place)Women's 800m Freestyle
Junko SakuraiHeat — 9:13.27 (→ did not advance, 18th place)Women's 4 × 100 m Freestyle Relay
Junko Sakurai, Chikako Nakamori, Miki Saito, and Kaori YanaseHeat — 3:54.68 (→ did not advance)Women's 4 × 100 m Medley Relay
Naomi Sekido, Hiroko Nagasaki, Naoko Kume, and Kaori YanaseHeat — 4:17.59Final — DSQ (→ no ranking)Women's 100m Backstroke
Naomi SekidoHeat — 1:05.60 (→ did not advance, 18th place)Nozomi SunouchiHeat — 1:07.23 (→ did not advance, 23rd place)Women's 200m Backstroke
Naomi SekidoHeat — 2:18.52B-Final — 2:18.87 (→ 14th place)Nozomi SunouchiHeat — 2:25.05 (→ did not advance, 22nd place)Women's 200m Butterfly
Naoko KumeHeat — 2:13.31Final — 2:12.57 (→ 6th place)Kiyomi TakahashiHeat — 2:14.37B-Final — 2:16.27 (→ 12th place)Women's 200m Individual Medley
Hideka KoshimizuHeat — 2:23.38B-Final — 2:22.81 (→ 15th place)Women's 400m Individual Medley
Hideka KoshimizuHeat — 4:59.18B-Final — 4:58.02 (→ 14th place)Men's Team CompetitionPreliminary Round (Group B)Defeated China (3-0)Defeated Italy (3-2)Defeated Egypt (3-0)Lost to Canada (0-3)Classification Matches5th/8th place: Lost to Argentina (1-3)7th/8th place: Defeated China (3-0) → 7th placeTeam RosterKoshi SobuEiji ShimomuraKazuya MitakeEizaburo MitsuhashiHiroaki OkunoYasushi FurukawaShuji YamadaMikiyasu TanakaKimio SugimotoMinoru IwataAkihiro IwashimaShunichi KawaiWomen's Team CompetitionPreliminary Round (Group A)Defeated South Korea (3-1)Defeated Peru (3-0)Defeated Canada (3-0)Semi FinalsLost to China (0-3)Bronze Medal MatchDefeated United States (3-1) → Bronze MedalTeam RosterYumi EgamiKimie MoritaYuko MitsuyaMiyoko HiroseKyoko IshidaYoko KagabuNorie HiroKayoko SugiiyamaSachiko OtaniKeiko MiyajimaEmiko OdakaKumie NakadaMen's Team CompetitionPreliminary Round (Group C)Lost to Italy (5-15)Lost to West Germany (8-15)Lost to Australia (2-15)Final Round (Group E)Lost to China (4-10)Lost to Greece (7-14)Lost to Canada (5-8)Defeated Brazil (9-8) → 11th placeTeam RosterEtsuji FujitaYoshifumi SaitoKoshi FujimoriShingo KaiNarihito TaimaDaisuke HoukiToshio FukumotoToshiyuki MiyaharaHisayoshi NagataKoji WakayoshiHisaharu SaitoShinji YamasakiAsami Oura 
