A miniature speaker comprises a first housing body and a second housing body, which are combined together. A vibrating system and a magnetic circuit system are accommodated in a space defined by the first housing body and the second housing body. The miniature speaker is characterized in that the sidewall at the end of the second housing body, which is combined with the first housing body, surrounds the periphery of the first housing body; a gap is provided between the outer edge of the first housing body and the inner side of the sidewall of the second housing body; the miniature speaker further comprises a sealing member which covers the first housing body, and the edge of the sealing member is located in the gap, which makes the gap between the first housing body and the second housing body sealed.