A high-yield fabricating method of a semiconductor device including a peeling step is provided.
A peeling method includes a step of stacking and forming a first material layer and a second material layer over a substrate and a step of separating the first material layer and the second material layer from each other. The second material layer is formed over the substrate with the first material layer therebetween. The first material layer includes a first compound layer in contact with the second material layer and a second compound layer positioned closer to the substrate side than the first compound layer is. The first compound layer has the highest oxygen content among the layers included in the first material layer. The second compound layer has the highest nitrogen content among the layers included in the first material layer. The second material layer includes a resin. In the step of separating, the first material layer and the second material layer are separated from each other by irradiation of an interface between the first material layer and the second material layer or the vicinity of the interface with light.