Double-side processing method for easily damaged workpieces using heat-peelable adhesive sheet

[57] [Summary] [Problem] To provide a double-sided processing method for an easily damaged workpiece capable of processing both surfaces of an easily damaged workpiece with excellent accuracy without damaging the workpiece. To do. SOLUTION: A double-sided processing method for an easily damaged workpiece uses two heat-peelable pressure-sensitive adhesive sheets having different peeling temperatures, and (A) After sticking the heat-peeling adhesive sheet having the lower peeling temperature (low-temperature peelable pressure-sensitive adhesive sheet) to one surface of the workpiece, (B) processing the other surface, (C) A heat-peelable pressure-sensitive adhesive sheet having a higher peeling temperature (high-temperature peelable pressure-sensitive adhesive sheet) is attached to the processed surface of the workpiece, and (D) a temperature higher than the peel temperature of the low-temperature peelable pressure-sensitive adhesive sheet and high-temperature peelable. A temperature lower than the peeling temperature of the mold pressure-sensitive adhesive sheet is applied to peel off the low-temperature peelable pressure-sensitive adhesive sheet. (E) After processing the surface of the workpiece on which the low-temperature peelable pressure-sensitive adhesive sheet is peeled, (F ) It is characterized in that the high temperature peelable pressure-sensitive adhesive sheet is peeled off by applying a temperature higher than the peeling temperature of the high temperature peelable pressure sensitive adhesive sheet.