Japan has an embassy in Phnom Penh. Trade is sizable between the two countries:

?Japan to Cambodia: 14.0 billion yen (2006)
?Cambodia to Japan: 9.5 billion yen (2006)

Japanese investment in Cambodia includes Phnom Penh Commercial Bank, a joint venture of Hyundai Switzerland and Japanese SBI Group, opened in 2008. Japan remains Cambodia?s top donor country providing some US$1.2 billion in total overseas development assistance (ODA) during the period since 1992.[5] In 2006, Japanese and Cambodian governments signed an agreement outlining a new Japanese aid program worth US$59 million.

The Japanese Government has provided significant assistance for demining and education.

?Japanese embassy in Cambodia