2005 was the first year the number exceeded 3 million, Cabinet Office official Toshiaki Nagato said. Japans population in 2005 was 127 million.
But he said it likely reflected an increase in the number of mental health care facilities and other treatment options that allow more sufferers to come forward and be counted.
The government has earmarked substantial funds for programs to help those with depression and other mental illnesses and is more actively involved in trying to get those affected to seek help through awareness programs.
Conditions regarded as mental illnesses in the report included addictions, Alzheimers disease Alzheimers disease, depression, epilepsy and stress-related disabilities.
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