The invention relates to a wrist device, particularly to a fastening mechanism of a cover part and a plastic body part of the wrist device. The fastening mechanism comprises a fastening structure, which in turn comprises a projecting grip structure extending at least partly into the body part, setting against a positioning surface of the body part, and blocked in relation to the mounting direction of the cover part to prevent the fastening structure from moving in a direction opposite to the mounting direction once the fastening structure has been pressed into the body part.
