A blasting method in which an abrasive is ejected together with a compressed gas onto a workpiece through a blast nozzle, wherein a liquid introduction path is provided in the blast nozzle, having one end communicable with a liquid supply source and another end opened in a compressed gas flow path in the blast nozzle, the liquid introduction path being configured to cause a liquid introduced from the liquid supply source to strike with a stream of compressed gas flowing through the blast nozzle, and a flow rate control means is provided between the liquid introduction path and the liquid supply source, wherein the blast nozzle is a suction-type blast nozzle provided with a nozzle tip directed in the ejection direction of a rear nozzle communicated with a compressed gas supply source, and with an abrasive introduction chamber communicated with an abrasive supply source between the rear nozzle and the nozzle tip, the blast nozzle being configured to create a negative pressure in the abrasive introduction chamber by ejection of a stream of compressed gas from the rear nozzle to suck an abrasive in the abrasive supply source, and eject the compressed gas and the abrasive as a mixed fluid, characterised in that the liquid introduction path is formed by a conduit inserted concentrically in the compressed gas flow path provided in the rear nozzle, and the other end of the liquid introduction path is opened at the ejection port of the rear nozzle the method comprising the step of: introducing a liquid into the blast nozzle and atomizing the liquid by causing the liquid to strike with the compressed gas flowing through the blast nozzle, and ejecting droplets of the liquid together with the compressed gas and the abrasive, wherein an amount of the liquid introduced into the blast nozzle being 0.06 cc/min to 150 cc/min and preventing the increase in surface temperature of the workpiece W by evaporating the atomized liquid in the space between the blast nozzle and the workpiece W or on the surface of the workpiece W. a flow rate control means is provided between the liquid introduction path and the liquid supply source, wherein the blast nozzle is a suction-type blast nozzle provided with a nozzle tip directed in the ejection direction of a rear nozzle communicated with a compressed gas supply source, and with an abrasive introduction chamber communicated with an abrasive supply source between the rear nozzle and the nozzle tip, the blast nozzle being configured to create a negative pressure in the abrasive introduction chamber by ejection of a stream of compressed gas from the rear nozzle to suck an abrasive in the abrasive supply source, and eject the compressed gas and the abrasive as a mixed fluid, characterised in that the liquid introduction path is formed by a conduit inserted concentrically in the compressed gas flow path provided in the rear nozzle, and the other end of the liquid introduction path is opened at the ejection port of the rear nozzle the method comprising the step of: introducing a liquid into the blast nozzle and atomizing the liquid by causing the liquid to strike with the compressed gas flowing through the blast nozzle, and ejecting droplets of the liquid together with the compressed gas and the abrasive, wherein an amount of the liquid introduced into the blast nozzle being 0.06 cc/min to 150 cc/min and preventing the increase in surface temperature of the workpiece W by evaporating the atomized liquid in the space between the blast nozzle and the workpiece W or on the surface of the workpiece W.