[4] Trained by former sumos Toyonobori and Mr. Hito at the Japan Pro Wrestling Alliance Dojo, Eigen followed Antonio Inoki to form Tokyo Pro Wrestling, where he debuted on October 12, 1966, against future rival Masao Kimura.

After a brief interpromotional feud with International Wrestling Enterprise, however, Tokyo Pro folded and he followed Inoki to JWA.

After spending six years struggling on the undercard, he finally left JWA in 1973, and the promotion soon folded.

Upon returning to Japan full-time with NJPW, Eigen became a solid hand for the undercard and mid-card matches.

He would remain with All Japan until the Pro Wrestling Noah exodus in June 2000, ending his nearly sixteen-year run with AJPW.

However, in January 2005, he was given a shot at the GHC Openweight Hardcore Championship against Naomichi Marufuji, but narrowly lost.

He wrestled his last match of his career on March 26, 2006, teaming with Jun Akiyama, in a loss to Akira Taue and Masao Inoue.

After retiring, Eigen focused on his work as executive director of Pro Wrestling Noah, overseeing sales and marketing.