Abstract: An atomic layer deposition device having a scan-type reactor includes multiple unit process chambers arranged in a stacking type for an atomic layer deposition process. The atomic layer deposition device includes upper and lower process chamber parts able to be separated from and coupled to each other. The scan-type reactor moves between the upper and lower process chamber parts over a substrate to which a raw material precursor is adsorbed, and causes a reaction precursor to react with the raw material precursor. The device fundamentally eliminates an area of coexistence of the raw material precursor and the reaction precursor, thereby making unnecessary any additional process for removing films so as to prevent films from being deposited outside the substrate, extending the maintenance cycle, and improving thin film quality and productivity through particle generation suppression.