|Height||5 ft 5 1⁄2 in (166 cm)|
|Reach||67 1⁄2 in (171 cm)|
|Born||January 17, 1984|
|Wins by KO||12|
He competed for his native country at the 2004 Summer Olympics in Athens, Greece, where he was stopped in the first round of the men's light flyweight division (– 48 kg) by Ethiopia's Endalkachew Kebede (21:26). Igarashi replaced Nauman Karim as a lucky loser, the Pakistani fighter dropped out "due to technical reasons". Igarashi amassed an amateur record of 77 wins (16 KOs) 18 losses, and graduated from the Tokyo University of Agriculture.
After turning professional in 2006, he made his professional debut with a third-round knockout on August 13 of that year. Fighting out of Teiken Boxing Gym in Tokyo under Yūichi Kasai's instruction, Igarashi gained the Japanese flyweight interim title via a split decision on August 2, 2008. Although Igarashi lost to the regular champion Tomonobu Shimizu four months later, he captured the vacated Japanese flyweight title by a third-round knockout on February 5, 2011. He defended it once, until June of the same year.
On July 16, 2012, Igarashi barely outpointed Sonny Boy Jaro via a split decision to win the WBC, The Ring and lineal flyweight titles in Kasukabe, Saitama. He defended his both titles against previously undefeated Nestor Daniel Narvaes via a majority decision in Sendai, Miyagi on November 3 of that year.
He fought former WBA minimumweight champion Akira Yaegashi in his second defense at the Ryōgoku Kokugikan on April 8, 2013. Igarashi and his team had initially planned the fight against Edgar Sosa. However, when it turned out that it would not be signed, Igarashi made a direct appeal to his promoter for the fight against Yaegashi. Igarashi mentioned that while his championship belt would be at stake, Yaegashi's popularity and recognition also would be on the line for that fight. Igarashi has so far fought against Yaegashi four times (once in his high school days, and three times in his university years) and won every time. Their trainers, Kasai (mentioned above) and Kōji Matsumoto (for Yaegashi) are high school alumni. Both are former OPBF champions and three-time world title challengers. Igarashi lost to Yaegashi in a unanimous decision.
Professional boxing record
|Professional record summary|
|29 fights||23 wins||3 losses|
|Loss||23-3-3||Sho Kimura||TKO||9 (12), 2:34||2017–12–31||Ota-City General Gymnasium, Tokyo||For WBO Flyweight title.|
|Draw||23-2-3||Miguel Cartagena||TD||3 (10), 0:49||2017–04–01||Korakuen Hall, Tokyo|
|Win||23-2-2||Weerachai Taboonrueang||TKO||2 (8), 0:43||2016–09–10||Korakuen Hall, Tokyo|
|Win||22-2-2||Joel Taduran||UD||10||2016–05–07||Korakuen Hall, Tokyo|
|Draw||21-2-2||Jonathan Francisco||TD||5 (10), 1:52||2015–11–24||Korakuen Hall, Tokyo|
|Win||21-2-1||Renerio Arizala||UD||10||2015–06–06||Korakuen Hall, Tokyo|
|Win||20-2-1||Efrain Perez||TD||10 (10), 0:20||2015–02–07||Korakuen Hall, Tokyo|
|Win||19-2-1||Renren Tesorio||TD||9 (10), 1:03||2014–09–06||Korakuen Hall, Tokyo|
|Win||18-2-1||Omar Soto||KO||9 (10), 2:32||2013–09–07||Korakuen Hall, Tokyo|
|Loss||17-2-1||Akira Yaegashi||UD||12||2013–04–08||Ryōgoku Kokugikan, Tokyo||Lost WBC, The Ring and Lineal Flyweight titles.|
|Win||17-1-1||Nestor Narvaes||MD||12||2012–11–03||Xebio Arena, Sendai, Miyagi||Retained WBC, The Ring and Lineal Flyweight titles.|
|Win||16–1–1||Sonny Boy Jaro||SD||12||2012–07–16||Winghat, Kasukabe, Saitama||Won WBC, The Ring and Lineal Flyweight titles.|
|Win||15–1–1||Wilbert Uicab||UD||12||2011–11–06||Yoyogi National Gymnasium, Tokyo||WBC Flyweight title eliminator.|
|Win||14–1–1||Kenji Yoshida||TD||8 (10) 1:14||2011–06–04||Korakuen Hall, Tokyo||Ret. Japanese Flyweight title.|
|Win||13–1–1||Takayasu Kobayashi||TKO||3 (10) 2:07||2011–02–05||Korakuen Hall, Tokyo||Won vacant Japanese Flyweight title.|
|Win||12–1–1||Armando Santos||UD||8||2010–11–06||Korakuen Hall, Tokyo|
|Win||11–1–1||Rexon Flores||KO||1 (8) 1:46||2010–07–03||Korakuen Hall, Tokyo|
|Win||10–1–1||Abel Ochoa||TKO||6 (8) 2:38||2010–03–06||Korakuen Hall, Tokyo|
|Win||9–1–1||Erick Diaz Siregar||RTD||5 (8) 3:00||2009–11–07||Korakuen Hall, Tokyo|
|Win||8–1–1||Yuchi Carryboy||TKO||6 (8) 0:15||2009–07–04||Korakuen Hall, Tokyo|
|Loss||7–1–1||Tomonobu Shimizu||UD||10||2008–12–23||Ryōgoku Kokugikan, Tokyo||For Japanese Flyweight title.|
|Win||7–0–1||Tomoya Kaneshiro||SD||10||2008–08–02||Korakuen Hall, Tokyo||Won interim Japanese Flyweight title.|
|Win||6–0–1||Alex Buckie||KO||6 (8) 1:30||2008–04–19||Korakuen Hall, Tokyo|
|Draw||5–0–1||Naoto Saito||MD||8||2007–12–01||Korakuen Hall, Tokyo|
|Win||5–0||Masatsugu Okada||TKO||7 (8) 1:20||2007–08–04||Korakuen Hall, Tokyo|
|Win||4–0||Tomoaki Handa||UD||6||2007–05–03||Ariake Coliseum, Tokyo|
|Win||3–0||Manachai Sithsaithong||KO||1 (8) 1:29||2007–02–03||Korakuen Hall, Tokyo|
|Win||2–0||Myung Jae-Sung||TKO||6 (6) 0:19||2006–11–13||Nippon Budokan, Tokyo|
|Win||1–0||Kim Yun-Woo||KO||3 (6) 1:07||2006–08–12||Korakuen Hall, Tokyo|
- List of flyweight boxing champions
- List of Japanese boxing world champions
- Boxing in Japan
- 1st AIBA Asian 2004 Olympic Qualifying Tournament
- 2nd AIBA Asian 2004 Olympic Qualifying Tournament
- Japan at the 2004 Summer Olympics
- Boxing at the 2004 Summer Olympics – Light flyweight
- "Profile" (in Japanese). Igarashi Toshiyuki Official Site. 2008. Archived from the original on March 28, 2009. Retrieved August 25, 2011.
- Hisao Adachi (May 29, 2011). "Igarashi vs Yoshida Clash on June 4 at Korakuen Hall". BoxingScene.com. Retrieved August 25, 2011.
- 五十嵐俊幸がデビュー戦勝利 (in Japanese). Nikkan Sports. August 12, 2006. Archived from the original on August 18, 2006. Retrieved August 25, 2011.
- Joe Koizumi (February 6, 2011). "Igarashi wins Japanese 112lb title". Fightnews.com. Archived from the original on February 10, 2011. Retrieved February 14, 2011.
- Joe Koizumi (June 5, 2011). "Igarashi keeps Japanese 112 belt". Fightnews.com. Archived from the original on June 9, 2011. Retrieved June 6, 2011.
- Joe Koizumi (November 6, 2011). "Igrashi wins WBC eliminator". Fightnews.com. Retrieved November 6, 2011.
- "Toshiyuki Igarashi - Lineal Flyweight Champion". The Cyber Boxing Zone Encyclopedia.
- "Igarashi wins RING flyweight title with split-decision victory over Jaro". The Ring. July 16, 2012. Archived from the original on December 28, 2013. Retrieved February 10, 2013.
- "Igarashi retains flyweight crown; Yamanaka knocks out Rojas". Fox News. November 3, 2012. Retrieved February 10, 2013.
- 五十嵐「有名になるため」八重樫は踏み台!…ＷＢＣ世界フライ級戦 (in Japanese). Sports Hochi. January 24, 2013. Archived from the original on February 9, 2013. Retrieved February 10, 2013.
- 東北出身の五十嵐と八重樫が因縁対決 (in Japanese). Daily Sports. January 24, 2013. p. 3. Retrieved February 10, 2013.
- "Yaegashi outclasses Igarashi to nab WBC flyweight title". Japan Times. April 9, 2013. Retrieved October 21, 2013.
- Professional boxing record for Toshiyuki Igarashi from BoxRec
- Toshiyuki Igarashi Biography and Olympic Results | Olympics at Sports-Reference.com
- Igarashi Toshiyuki Official Site at the Wayback Machine (archived June 3, 2009) (in Japanese)
- Toshiyuki Igarashi - CBZ Profile
Sonny Boy Jaro
| WBC flyweight champion
July 16, 2012 – April 8, 2013
| Lineal flyweight Champion|
July 16, 2012 – April 8, 2013
| The Ring flyweight champion|
July 16, 2012 – April 8, 2013