Provided is an adhesive sheet which is used for portable electronic devices, and which is capable of achieving excellent air release properties. According to the present invention, provided is an adhesive sheet for portable electronic devices. The adhesive sheet is provided with: a film-like base material; and an adhesive layer provided to at least one surface of the film-like base material. The thickness of the adhesive layer is not more than 20 [mu]m. A coating layer which partially covers the surface of the adhesive layer is further provided. Furthermore, the thickness of the coating layer is less than 3 [mu]m.