| Jidaishin | |
| Type: | single |
| Artist: | Do As Infinity |
| Album: | Eight |
| Released: | September 29, 2010 |
| Genre: | J-pop |
| Length: | 3:56 |
| Label: | Avex Trax |
| Producer: | Seiji Kameda |
| Prev Title: | ∞2 |
| Prev Year: | 2010 |
| Next Title: | Chikai |
| Next Year: | 2011 |
"Jidaishin" is Do As Infinity's 24th single, released on September 29, 2010. It was released on the band's 11th anniversary[1] and was sold only at the mu-mo website in Japan. This single was offered in two different ways, both with special boxes that brought the CD plus some personalized face and body towels. It contains two tracks: the single and its instrumental version. It was composed by Kazunori Watanabe. The same day Do As Infinity released the single, there was a free concert, aired on the Nico Nico Douga website for its promotion.