Abstract: The invention provides a microspeaker diaphragm edge member having superior heat resistance, cold resistance, moisture resistance, formability, and high internal loss property, a diaphragm employing such a microspeaker diaphragm edge member, a microspeaker employing such a diaphragm, and an electronic device incorporating such a microspeaker. To constitute such an edge member, an intermediate layer featuring a high damping effect has a constraining layer of polyetheretherketone (PEEK) disposed on one face thereof and a constraining layer of either polyetheretherketone (PEEK) or polyetherimide (PEI) disposed on the other face thereof.