Acoustic diaphragm, manufacturing method therefor, and acoustic device

Provided is an acoustic diaphragm with required properties for a vibrating part and an edge part thereof. The acoustic diaphragm comprises a vibrating part 11 and an edge part 12 located at an outer periphery of the vibrating part, wherein the vibrating part comprises a thermoplastic liquid crystal polymer (TLCP) having a certain composition; the edge part comprises a TLCP having a same composition as the TLCP of the vibrating part; and the vibrating part 11 and the edge part 12 have elastic moduli Ed and Ee measured by nanoindentation technique, respectively, which satisfy the following formula: Ed>Ee. For example, a ratio Ed/Ee of the elastic modulus Ed of the vibrating part 11 to the elastic modulus Ee of the edge part 12 may fall within a range of from 1.05 to 5.0.