The purpose of this study to identify what kind of factor that influences the number of tourists visit by using the travel cost method approach and also to estimate the economic value of Gajah Mungkur Reservoir in Wonogiri regency. The valuation of Gajah Mungkur Reservoir using individual travel cost method. This study is done in Wonogiri regency, Province Central Java. This study uses primary data with interview method. Sample used in this study is 270 respondents. This analysis of the study is multiple linear regression. The factors which affect the number of visit in Gajah Mungkur Reservoir in Wonogiri regency are travel cost, income, education, distance, age, dummy facility, dummy day visit, number of family, dummy marriage status, accompany, and leisure time. Economic value of Gajah Mungkur Reservoir based on individual travel cost method is Rp. Rp. 825.003.120,00 with consumer surplus per individual per visit is Rp. 3.600,00.