Method for etching insulation film

A method for etching an insulation film of a processing target object that includes a wiring layer, the insulation film formed on the wiring layer, and a mask formed of an organic film on the insulation film, the method comprising:

• in a first term, periodically switching ON and OFF of at least one of a first non-DC power and a second non-DC power so as to excite a processing gas containing fluorocarbon and supplied into a processing container of a plasma processing apparatus, a frequency of the first non-DC power being higher than that of the second non-DC power;
• and
• in a second term subsequent to the first term, setting the first non-DC power to be continuously turned ON so as to excite the processing gas supplied into the processing container, in which, in one cycle consisting of a term where the first non-DC is turned ON and a term where the first non-DC power is turned OFF in the first term, the second term is longer than the term where the first non-DC power is turned ON,
• wherein the periodically switching ON and OFF of at least one of the first non-DC power and the second non-DC power, and the setting the first non-DC power to be continuously turned ON are alternately repeated.