Four-wheel riding-type cultivator is mainly used for pesticide applicator, fertilizer spreader and vinyl mulching in Korea. Adjustment of the vehicle width depends on the farming modes and to whom it is attached. It is difficult to check the work status. So a three-wheel riding-type cultivator is being developed for the field of crops to improve performance such as ground clearance, width control, steering system and work convenience. In order to optimally design, structural analysis of the connection part and rear support was carried out. In this study, 3D modeling of the rear support and connection part was followed by analysis of the strain, stress and safety factor of the three-wheel riding-type cultivator using CAE. First, drawings of the three-wheel riding-type cultivator were prepared in 3D using Solid Works and then linear static analysis was conducted with the ANSYS Ver.13.0 structural analysis program. Structural Steel was selected as the material of the three-wheel riding-type cultivator and the automatic mesh generator of ANSYS was used. The mesh consists of 52,018 nodes and 24,713 elements. And contact and constraint conditions were set. The 5,439 N load was applied to the two connection parts in consideration of the weight of the three-wheel drive type control unit. A linear static analysis was carried out for checking static state operation. Finally, strain and stress, safety factor were analyzed. As a result of the stress analysis, the deformation amount was 8.4 mm at the connection part of the upper support frame. The bottom support part was most vulnerable to safety factor 0.3. Therefore, the materials of this site would be reinforced and supplemented.