In order to easily control the laser pulse width and perform high-precision processing, the method for processing a material by laser ablation according to the present invention is characterized in that the material having a region of which a double logarithmic chart shows a linearly-shaped line with a gradient of not more than 0.5, when a relationship between laser pulse width and ablation threshold is represented in the logarithmic chart with a laser pulse width in picosecond plotted along the horizontal axis and an ablation threshold in J/cm 2 plotted along the vertical axis, is processed by the pulsed laser beam having the laser pulse width within the region.