Tokyo Commodity Exchange (TOCOM) futures fell slightly on Wednesday, tracking weak Shanghai futures.
The benchmark TOCOM rubber contract for December delivery finished 0.9 yen ($0.0083) lower at 186.1 yen per kg.
The most-active rubber contract on the Shanghai Futures Exchange for September delivery fell 45 yuan ($6.54) to finish at 10,685 yuan per tonne.
TOCOM's technically specified rubber (TSR) 20 futures contract for January delivery was unchanged at 153.3 yen per kg.
The front-month rubber contract on Singapore's SICOM exchange for August delivery last traded at 142.1 US cents per kg, down 0.1%.
The US dollar was quoted around 108 yen, compared with around 108.21 yen on Tuesday afternoon.
Oil prices nudged higher on rising tensions over Iran, a sharp fall in US crude stocks and positive signs on Sino-US talks, although worries about weak demand kept a cap on gains
Japan's benchmark Nikkei stock average was up 0.41%.
