Protective sheet, method for producing electronic component, and method for producing glass piece forming display surface of display apparatus

A protective sheet for being attached to a protected surface of an electronic component having the protected surface, one surface of a glass piece forming a display surface of a display apparatus, or one surface of a glass plate for obtaining the glass piece,

• the protective sheet comprising:
• a protective layer for being attached to the protected surface of the electronic component, the one surface of the glass piece, or the one surface of the glass plate,
• a first release liner and a second release liner that are in abutting contact respectively with both surfaces of the protective layer,
• wherein
• the protective layer is made of a water-soluble resin composition, and
• the surface of the protective layer with which the first release liner is in abutting contact and the surface of the protective layer with which the second release liner is in abutting contact each have a surface free energy of 25 mJ/m2 or more and 85 mJ/m2 or less.