Abstract: It is an object of this invention to provide a medical treatment device for curing snore and sleep palate syndrome, which is small in size, easy to place, allows patients to have communication after placement, does not induce the patients any physical disorder to jaw joint and jaw muscle, simple in operation and structure, and highly effective in physical treatment. There is provided a medical treatment device for curing snore and sleep apnea syndrome, which comprises a fitting body 10 and a guide plate 20. The fitting body 10 is formed in a generally U-shape in plane view and in cross section, and it is fitted to the teeth 3 and the gingiva 5 of the upper jaw 1. The guide plate 20 is extended in the diagonal rear lower side direction from the front portion of the fitting body 10. The guide plate 20 makes a contact with front teeth 4a of a lower jaw 2 at an outer surface 21 thereof, and it forwards the front teeth 4a of the lower jaw 2 to take a forwarding position.