The purpose of this study is to understand information behavior of older adults with diabetes. After reviewing previous research, related factors are identified and a questionnaire was devised. The structured interview was administered to the aged 60 and over in the B hospital (N=543). Data about awareness of the disease, health literacy, information environment, information need, information seeking, information use, information service, and personal background are collected and analyzed descriptively. Relationship between variables are examined and hypotheses are tested to find factors affecting information behavior. The level of the awareness of the disease and health literacy appeared to be low. It is proved that awareness of the disease is a factor affecting information need and information use. Health literacy affects information use. There is a statistical significant difference between information need and information use by disease education and duration. There is also a statistical significant difference between information use among groups divided by information environment, sex, age, and education. Based on the results, campaign to raise disease awareness, marketing promotion about information support facilities, customized information service for older adults are suggested.