Patent ID: 8329558

Claim:
A processing method for a wafer having a device area where a plurality of devices are formed on the front side of said wafer and a peripheral marginal area surrounding said device area, said processing method comprising: a reinforcing plate forming step of applying a heat-resistant bond to the front side of said wafer and solidifying said heat-resistant bond to thereby form a reinforcing plate from only said heat-resistant bond; a back grinding step of holding said reinforcing plate on a chuck table and grinding the back side of said wafer in said device area to thereby form a circular recess in said device area and leave an annular reinforcing portion in said peripheral marginal area; a through electrode forming step of forming a through electrode connected to an electrode of each device formed on the front side of said wafer, from the back side of said wafer fixed to said reinforcing plate; and a reinforcing plate removing step of supplying a solvent for dissolving said heat-resistant bond to said reinforcing plate, thereby removing said reinforcing plate.