Backgrounds and Objective:Physical activity is one of the important and effective factors associated with the human health. The elderly are among the most vulnerable groups in many diseases and disorders that exercise can prevent of many of these diseases. The aims of this study is to determine the level of physical activity among elderly of Karaj city and its relationship with some the demographic factors.

Materials and Method: This cross-sectional study was conducted in the first half of 2014 and in health centers of Karaj city, Iran. The study population were people older than 60 years (n=286) who referred to these centers. A short physical activity questionnaire (IPAQ) was used to collect data. Data were analyzed by SPSS and the descriptive and analytical tests. 

Results: The age mean of elderly was 67/37 ± 6/5 years. The majority of them (52/4%) were woman & (54/2 %) were in families with 4-6 members. About physical activity level in participant finding show that 50/5% were in low level, 43/1% intermediate and 6/4% were in high level. A significant relationship was between gender & job in elderly with level of physical activity (P<0/05). 

Conclusion: According to the results it seems that for encourage and remove the barriers of doing physical activity in elderly, basic plans must be done at the macro level of management. So it is suggested that more researches and interventions about barriers of doing physical activity be done in elderly of Karaj city.