This study investigated the relationship between modern age industrial heritage and urban regeneration in Japan through Tomioka Silk Mill and related sites (富岡製絲場と絹産業遺産群) registered in the UNESCO World Cultural Heritage Sites for the first time as a ‘modern age industrial heritage’ of Japan in April 2014. First, this study investigated the process in which with the ‘Centenary Celebration for the Conception of Japanese Modern Industry’ held by Tomioka City in 1972 as a momentum, Tomioka Silk Mill became perceived as the first ‘modernized heritage’ in which the propaganda that Japan was the only country that succeeded in ‘modernization’ in the non-Western world was reflected. In addition, this study found out that it was an example of the so-called Machizukuri by the united efforts of officials and people, promoted as the residents rather pressed the right of private ownership, just as good as the government, using historical publicness as a weapon, judging from the characteristics, totally different from the contents of Machizukuri in Japan, which has been analyzed from the innovative perspective, such as the conflict between Tomioka City and Katakura Industries surrounding the preservation of the Tomioka Silk Mill, the promotion of a plan for ‘Machizukuri’ to register it as a world heritage and the active participation and cooperation of the local residents.