FIRST PROTECTIVE FILM FORMING SHEET

This first protection film forming sheet is provided with a first base material, a buffer layer formed on the first base material, and a curable resin film formed on the buffer layer. When test pieces for each of the buffer layer and the curable resin film are fabricated having a diameter of 8 mm and a thickness of 1 mm, and a strain distribution measurement is performed to measure the shearing modulus G' of the test pieces by producing a strain in the test pieces under conditions of 90øC and 1 Hz, a shearing modulus Gb300' of the test piece for the buffer layer when the test piece for the buffer layer has a strain of 300 pcnt , and a shearing modulus Gc300' of the test piece for the curable resin film when the test piece for the curable resin film has a strain of 300 pcnt satisfy the relationship Gb300' = Gc300'.