A head-mounted display, comprising: a display device comprising one display body and two support arms extending from two opposite ends of the display body respectively; a headphone device comprising two headphone bodies for outputting an audio signal; a head-mounted bracket comprising a head-mounted portion and two connection portions extending from two ends of the head-mounted portion respectively; and two connection mechanisms connecting each support arm to one corresponding headphone body and one corresponding connection portion, wherein each connection mechanism comprises a first rotation member and a second rotation member, the first rotation member connects each support arm and the corresponding headphone body, the second rotation member rotatably connects the first rotation member to the corresponding connection portion; wherein one of the first rotation member and the second rotation member comprises a circumferential wall with a tooth-shaped structure, the other one of the first rotation member and the second rotation member comprises a resilient sheet engaging with the tooth-shaped structure, and the first rotation member and the second rotation member rotate relative to each other by engaging the tooth-shaped structure with the resilient sheet under an external force; characterized in that, the one of the first rotation member and the second rotation member comprising the resilient sheet further comprises two resilient sheet fixing portions, the resilient sheet comprises two portions extending outside the resilient sheet fixing portions and engaging with the tooth-shaped structure, and one of the two portions is located at a gap between two adjacent teeth of the tooth-shaped structure, the other portion is pressed to connect with a tooth of the tooth-shaped structure. a display device comprising one display body and two support arms extending from two opposite ends of the display body respectively; a headphone device comprising two headphone bodies for outputting an audio signal; a head-mounted bracket comprising a head-mounted portion and two connection portions extending from two ends of the head-mounted portion respectively; and two connection mechanisms connecting each support arm to one corresponding headphone body and one corresponding connection portion, wherein each connection mechanism comprises a first rotation member and a second rotation member, the first rotation member connects each support arm and the corresponding headphone body, the second rotation member rotatably connects the first rotation member to the corresponding connection portion; wherein one of the first rotation member and the second rotation member comprises a circumferential wall with a tooth-shaped structure, the other one of the first rotation member and the second rotation member comprises a resilient sheet engaging with the tooth-shaped structure, and the first rotation member and the second rotation member rotate relative to each other by engaging the tooth-shaped structure with the resilient sheet under an external force; characterized in that, the one of the first rotation member and the second rotation member comprising the resilient sheet further comprises two resilient sheet fixing portions, the resilient sheet comprises two portions extending outside the resilient sheet fixing portions and engaging with the tooth-shaped structure, and one of the two portions is located at a gap between two adjacent teeth of the tooth-shaped structure, the other portion is pressed to connect with a tooth of the tooth-shaped structure.