Objectives : The purpose of this study was to identify the effect on cognitive function in elderly people above 65 years of age. Methods : The data were collected from June 1 to August 30 2014. Data were collected by questionnaire from 994 elderly people. The instruments for this study were ADL, IADL, depression, MMSE-DS. The data were analyzed using descriptive statistics, t-test, ANOVA, Pearson's correlation coefficients, multiple linear regression with the SPSS/WIN 18.0 program. Results : The significant factors influencing MMSE-DS were education(β=-0.314, p<.001), IADL(β=0.196, p<.001), age(β=-0.168, p<.001), exercise time(β=0.089, p=.004), economic conditions(β=0.086, p=.007), depression(β =-0.084, p=.001), income(β=-0.083, p=.003), sleep time(β=-0.079, p=.001), medical insurance(β=0.059, p=.024) and leisure(β=0.057, p=.039). Conclusions : Based on the study, subjects with cognitive impairment detected at an early stage it is necessary to intervene in consideration of the individual characteristics and to develop and apply the program that improve the living habits such as exercise and sleep, and decreasing depression.