The present disclosure discloses a diaphragm for radiating sound, includes: a dome part and a suspension part surrounding the dome part. The suspension part includes a first subgroup, a second subgroup, and a third subgroup arranged in a sequence, the first subgroup being close to the dome part, the third subgroup away from the dome part, and the second subgroup between the first and third subgroups. Each of the first, second, and third subgroups includes a number of patterns arranged along a circumference direction of the dome part. Selected patterns in the second subgroup are opposite to corresponding patterns in the first subgroup, and selected patterns in the second subgroup are opposite to corresponding patterns in the third subgroup; and each corner of the suspension part is provided with the first subgroup, the second subgroup and the third subgroup.