A head-mounted device for reducing symptoms of cybersickness includes a main shell, and a stimulation unit. The main shell includes first to third tube bodies that are arc-shaped and closed and that are worn respectively on the top and back of the user’s head and the user’s ear. The stimulation unit includes first to third components that can be accommodated respectively in the first to third tube bodies in a rolling, sliding or flowing manner with low friction, and produces, in respond to physical movement of one of the first to third components in a respective one of the first to third tube tubes caused by rotation of the user’s head, a stimulation force that is near the user’s vestibule and that is applied to the use’s vestibular through one end of the respective one of the first to third tube bodies to stimulate the user’s vestibular perception. |