A thermal transfer protective sheet was recently patented. It includes a base material, a release layer provided on the base material and a topcoat layer provided on the release layer. It is designed so that when the surface of the topcoat layer on the opposite side of the release layer is pressed against an object and heated, the topcoat layer adheres to the object. When the base material is peeled off from the object while the topcoat layer remains adhered to the object, at least a part of the topcoat layer adhered to the object remains on the object. The release layer includes a first and second resin mixed with each other. The first resin is a thermoplastic acrylic resin while the second resin is a thermoplastic resin incompatible with the first resin. The second resin has a glass transition point of 50°C or less. The mixing ratio of the first resin to the second resin in the release layer is 80:20 or more and 99:1 or less in a weight ratio. The release layer has a thickness of 1.0 μm or more and 3.0 μm or less.