According to current development trends for automotive body parts, light weight is a key issue in improving fuel efficiency and CO₂ reduction. Compared to steel and aluminum, magnesium has a relatively low specific gravity. However, it is challenging to use magnesium to produce a product at room temperature because magnesium has a Hexagonal Close-Packed (HCP) crystal structure. Therefore, the structure is not suitable for plastic deformation without using a heating system. So, we suggest the use of a Diamond-Like Carbon (DLC) coating when developing a magnesium sheet forming process. This coating can improve formability and the work environment by increasing the surface roughness. This study compared dies and product before and after DLC coating at same tryout conditions.