Due to the increase of income, people has a car more than one per household. So parking space is needed to minimum size for making many parking spaces. But narrow parking space causes that interference with another car is occurred when car's door is opening or closing. So sliding door is best way for solving the problem. But sliding structure of the door is difficult to apply to all vehicle because existing sliding structure is limited. For this reason, new sliding structure of the door is needed. In this study, we suggest new sliding mechanism of front door for vehicle and confirm the sliding mechanism using a finite element analysis.