| Position: | Point guard |
| Kei Igarashi | |
| Height Ft: | 5 |
| Height In: | 11 |
| Weight Lb: | 175 |
| Team: | Gunma Crane Thunders |
| League: | B.League |
| Number: | 7 |
| Nationality: | Japanese |
| Birth Date: | May 7, 1980 |
| Birth Place: | Jōetsu, Niigata, Japan |
| Highschool: | Hokuriku |
| College: | Chuo University |
| Draft: | Undrafted |
| Career Start: | 2003 |
| Years1: | 2003-2009 |
| Team1: | Hitachi Sunrockers |
| Years2: | 2009-2010 |
| Team2: | Toyota Alvark |
| Years3: | 2010-2016 |
| Team3: | Mitsubishi Electric |
| Years4: | 2016-2021 |
| Team4: | Niigata Albirex BB |
| Years5: | 2021-present |
| Team5: | Gunma Crane Thunders |
Kei Igarashi (五十嵐 圭、born May 7, 1980 in Jōetsu, Niigata, Japan) is a Japanese professional basketball player. He plays for the Gunma Crane Thunders of the B.League. He also was a member of the Japan national basketball team, playing for the team in the 2006 FIBA World Championship and both the FIBA Asia Championship 2007 and FIBA Asia Championship 2009.[1]
Igarashi averaged 9 points and 3 assists per game for the host Japanese at the 2006 FIBA World Championship.[2] Igarashi scored a team-high 18 points and added three assists in Japan's lone win at the tournament, a 78-61 preliminary round victory over Panama.[3] In his most recent, national team appearance, Igarashi had a team-leading 3.6 assists per game, good for third best overall in the tournament.[4] Despite his performance, Japan stumbled to a disappointing tenth-place finish, its worst ever performance in 24 FIBA Asia Championship appearances.
In the 2009-10 season, he entered the month-long winter break averaging 9.3 points and 2.9 assists per game for the Alvark.[5] The popular Igarashi was also named to the JBL All-Star Game as the leading point guard vote-getter for the East.[6]