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 . <EOS>