Obama geothermal area is located on the western side of Kyushu Island, southwestern Japan. This area is characterized by high potential geothermal resources that attract most of researchers to study the subsurface structure of the area. Euler deconvolution is applied to newly acquired gravity data to image the subsurface structures thereby aiding the geothermal exploration. The results were compared with the available geologic and geothermal information in order to get a relationship between structures and geothermal resources. These analyses indicate that the dominant subsurface faults trend E W, but N S trending faults also exist. The dominant orientation of these faults provides a geothermal relation between subsurface structures and geothermal resources in the Obama geothermalˆeld.