Disclosed is a wrist-worn device, including a device body and a wristband. The wristband includes: a band body including two detachable ends; an installation part provided on the band body; and a memory metal wire in a shape of a long strip extending along a length direction of the band body. The band body is provided with a first installation cavity, the installation part is provided with a second installation cavity communicated with the first installation cavity, and the device body is provided in the second installation cavity; the memory metal wire is provided in the first installation cavity and passes through the second installation cavity; the memory metal wire is configured with a memory state of being annular in a natural state; and the device body is provided with a positioning groove extending along the length direction of the band body.