Is there an unlimited day ticket for jr in Tokyo?

Yes, it's called Tokunai Pass, which is a kind of advanced discount ticket. With it, you can take all the ordinary trains (including express trains, which only have free seats in ordinary cars) in 23 districts of Tokyo for free and unlimited times. It can facilitate your shopping, food visit and business activities in Tokyo. Adult ticket is 750 yen, and child ticket is 370 yuan.

All outlets can return unused passes within the validity period. There is a handling fee for refunding tickets.

Tokyo Pass can be purchased at the designated ticket vending machine of JR East Japan Station, JR ticket office (Yemadukou, Midori) or tourist service center (viewing square) within the valid area of the pass (23 districts of Tokyo).