The objective of the present work is to examine evaporation cooling of droplet due to surface roughness under radiative heat input condition. The surface temperatures varied from $80~160^{circ}C$ on aluminum alloy (AL 2024) and surface roughness was $0.18{mu}m,;1.36{mu}m$. The results are as follows; Regardless of surface roughness under radiative heat input condition, as droplet diameter is larger, the in-depth temperature of solid decreases and evaporation time increases. In the case of $0.18{mu}m;and;1.36{mu}m$ of surface roughness, the larger the surface roughness is, the less the evaporation time is and the larger the temperature within the solid is. In the case of $Ra=0.18{mu}m$ evaporation time and time averaged heat flux for radiative heat input case is shorter than for the conductive case.