The company's latest online consumer confidence poll showed that 30% of the 7230 respondents said their "biggest concern" was holding onto their jobs.
This was an increase of 1%over the previous survey
conducted in May.
The economy and health were the second and third top concerns with 22% and 21% respectively, AC Nielsen said in a statement.
Asian economies have been battered this year by the outbreak of severe acute respiratory syndrome, the war in Iraq, terror threats and a global travel slump - pushing unemployment up and sending economies into a tailspin.
While not the main concern, 63% of respondents expressed at least "some concern" about health issues, virtually unchanged from the May poll, the statement said.
The number of respondents with at least "some concern" about terrorism fell to 32% from 39% in the last survey despite repeated warnings from governments that the threat from al-Qaida-linked terror groups was not over.
The survey was the result of a random online poll of consumers in Australia, China, India, Thailand, Singapore, Malaysia, Hong Kong, Taiwan, Korea, New Zealand, Philippines, Japan, and Indonesia.