A device for spraying a mold-releasing agent and a method therefor is provided by which a sticker and a defective drawing of a mold are prevented from occurring by detecting a leak of the mold-releasing agent, a clogging of a nozzle for spraying the mold-releasing agent, or a failure of a piece of equipment of the device for spraying the mold-releasing agent, to properly control the volume of the sprayed mold-releasing agent. A device 1 for spraying a mold-releasing agent that sprays a mold-releasing agent A on a pattern plate 20 in a molding machine that forms molds from molding sand S by using a flask 10 and the pattern plate 20, comprising a nozzle 30 for spraying the mold-releasing agent that sprays the mold-releasing agent A on the pattern plate 20, a piping 40 for supplying the mold-releasing agent that supplies the mold-releasing agent A to the nozzle 30 for spraying the mold-releasing agent, a flow sensor 42 that measures a flow rate of the mold-releasing agent A that flows in the piping 40 for supplying the mold-releasing agent, and a controller 90 that detects a leak of the mold-releasing agent A, a clogging of the nozzle 30 for spraying the mold-releasing agent, or a failure of a piece of equipment of the device 1 for spraying the mold-releasing agent, based on the measured flow rate.