A lightweight spray device with spray body that is suitable for precision cast molding, solving general casting problems, such as shrinkage and bubbling; and a process for manufacturing the same. The spray device is one with magnesium spray body provided with a spray part and a handle part, characterized in that the magnesium spray body is one formed with the use of a mold for magnesium spray body wherein a first slide pin is provided at a region where the spray part and the handle part cross each other and wherein around the first slide pin, there is provided a product melt orifice.