| Sunday, December 29th , 1957 | Signed free agent 1B Nobumasa Kashiwagi to a minor league contract. | Tuesday, December 24th , 1957 | Signed free agent C Tsumemasa Shiba to a minor league contract. | Thursday, December 19th , 1957 | Signed free agent RP Kikunojo Sakoda to a minor league contract. | Wednesday, December 11th , 1957 | Signed free agent SP Shigeharu Matsushima to a minor league contract. | Tuesday, December 10th , 1957 | Released SP Toru Inoue. | Monday, December 9th , 1957 | Signed free agent SP Toru Inoue to a minor league contract. | Thursday, December 5th , 1957 | Signed free agent RP Zaijiro Terada to a 1-year contract worth a total of $4,660. | Released RP Aki Yamane. | Wednesday, December 4th , 1957 | Released SP Naizen Sano. | Tuesday, December 3rd , 1957 | Signed free agent SP Naizen Sano to a minor league contract. | Monday, November 18th , 1957 | Signed free agent SP Naizen Sano to a minor league contract. | Saturday, November 16th , 1957 | Signed free agent RF Washichi Usui to a minor league contract. | Thursday, November 14th , 1957 | Signed free agent RP Fumimune Iwamoto to a minor league contract. | Thursday, November 7th , 1957 | Signed free agent 3B Chikato Sato to a minor league contract. | Tuesday, November 5th , 1957 | Signed free agent RP Shonosuke Yamaguchi to a minor league contract. | Wednesday, October 30th , 1957 | Signed free agent SP Naizen Sano to a minor league contract. | Sunday, October 27th , 1957 | Signed free agent 3B Chikato Sato to a minor league contract. | Sunday, October 20th , 1957 | Released SP Toru Inoue. | Saturday, October 19th , 1957 | Signed free agent SP Toru Inoue to a minor league contract. | Sunday, October 13th , 1957 | Signed free agent SP Naizen Sano to a minor league contract. | Saturday, October 12th , 1957 | 2B Takuzo Miyamoto retired from professional baseball. | Signed 3B Coach Harry Carr to a 2-year contract extension. | Signed Hitting Coach Yuu Hasegawa to a 2-year contract extension. | Signed Scouting Director Takayuri Mukai to a 2-year contract extension. | Signed Manager Taisei Hiramatsu to a 3-year contract extension. | Signed 1B Coach Jack Manzella to a 2-year contract extension. | Signed General Manager Monzaemon Ueno to a 2-year contract extension. | Thursday, October 3rd , 1957 | Signed free agent RP Yoshii Mizuno to a 1-year contract worth a total of $4,740. | Released RP Zaijiro Terada. | Friday, September 13th , 1957 | Signed free agent C Kaito Tsuji to a minor league contract. | Released C Kaito Tsuji. | Wednesday, September 11th , 1957 | Signed free agent C Kaito Tsuji to a minor league contract. | Released C Kaito Tsuji. | Friday, August 16th , 1957 | Signed free agent SP Toru Inoue to a minor league contract. | Released SP Toru Inoue. | Sunday, August 4th , 1957 | Signed free agent RP Naotake Fukushima to a minor league contract. | Saturday, August 3rd , 1957 | Signed free agent RP Yasutaka Miyamoto to a minor league contract with a major league option. | Released RP Benkei Nakao. | Sunday, July 28th , 1957 | Signed free agent SP Naizen Sano to a minor league contract. | Released SP Naizen Sano. | Friday, July 19th , 1957 | Signed free agent SP Seiryo Doi to a minor league contract. | Sunday, July 14th , 1957 | Signed free agent SP Yo Takemoto to a minor league contract. | Released SP Yo Takemoto. | Saturday, July 6th , 1957 | Placed SP Yukiharu Goto on the 14-day injured list, retroactive to 07/05/1957. | Signed free agent LF Akiho Uno to a minor league contract. | Wednesday, June 5th , 1957 | Signed free agent 3B Tenshin Shibata to a minor league contract. | Released RP Yasutaka Miyamoto. | Drafted 2B Mincho Hino in the 1957 first-year player draft (Round 1, Pick 4, 4th overall pick). | Drafted 1B Yasuaki Saito in the 1957 first-year player draft (Round 2, Pick 4, 16th overall pick). | Drafted C Yoshisada Kojima in the 1957 first-year player draft (Round 3, Pick 4, 28th overall pick). | Drafted RP Kikunojo Sakoda in the 1957 first-year player draft (Round 4, Pick 4, 40th overall pick). | Drafted RF Mitsuzuka Anzai in the 1957 first-year player draft (Round 5, Pick 4, 52nd overall pick). | Sunday, May 5th , 1957 | Signed free agent SS Takuyou Koyama to a 1-year contract worth a total of $4,620. | Released SS Harumi Kawai. | Friday, May 3rd , 1957 | Signed free agent RP Shiro Sawada to a 1-year contract worth a total of $4,500. | Released RP Eisei Sato. | Monday, April 15th , 1957 | Signed free agent SP Kuniaki Usui to a minor league contract. | Saturday, April 13th , 1957 | Signed free agent SP Kuniaki Usui to a minor league contract. | Tuesday, April 9th , 1957 | Signed free agent SP Seiryo Doi to a minor league contract with a major league option. | Released SP Seiryo Doi. | Tuesday, April 2nd , 1957 | Signed free agent SP Mitsunobu Fukui to a minor league contract. | Thursday, March 28th , 1957 | Signed free agent LF Masazumi Seki to a minor league contract. | Monday, March 25th , 1957 | Signed free agent SP Koudo Takara to a minor league contract. | Wednesday, March 20th , 1957 | Signed free agent SP Shigeharu Matsushima to a minor league contract. | Signed free agent SP Seiryo Doi to a minor league contract. | Wednesday, March 6th , 1957 | Signed free agent LF Masazumi Seki to a minor league contract. | Monday, March 4th , 1957 | Signed free agent RP Naotake Fukushima to a minor league contract. | Tuesday, February 26th , 1957 | Signed free agent SP Mitsunobu Fukui to a minor league contract. | Sunday, February 24th , 1957 | Signed free agent SP Mitsunobu Fukui to a minor league contract. | Sunday, January 27th , 1957 | Signed free agent SP Kuniaki Usui to a minor league contract. | Thursday, January 24th , 1957 | Signed free agent SP Mitsunobu Fukui to a minor league contract. | Monday, January 21st , 1957 | Signed free agent SP Natsuhiko Sugiura to a minor league contract. | Wednesday, January 16th , 1957 | Signed free agent SS Harumi Kawai to a 1-year contract worth a total of $7,800. | Released 3B Takuyou Koyama. | Tuesday, January 15th , 1957 | Signed free agent RP Jomei Yamada to a 1-year contract worth a total of $4,740. | Released RP Nobuo Yamane. | Sunday, January 13th , 1957 | Signed free agent RF Fuminobu Sato to a minor league contract. | Wednesday, January 9th , 1957 | Signed free agent RP Naotake Fukushima to a minor league contract. | Monday, January 7th , 1957 | Signed free agent LF Masazumi Seki to a minor league contract. | | |