Abstract: The present disclosure discloses a watch with a case convenient to replace. The watch includes a case, a movement and an inner container, wherein the movement is disposed on the inner container. The watch further includes an engagement structure for assembling the case and the inner container; when the case is dismounted, the engagement structure is pressed to be elastically compressed towards one side of the inner container so as to be disengaged from the case; and when the case is mounted, an outer side of the inner container is sleeved by the case, and the case is pressed along a side wall of the engagement structure, so that the engagement structure is engaged with the case. The watch is convenient to operate, so that a user can select the proper case and inner container to be matched and combined, and waste caused by purchasing various different watches is avoided.