The present invention relates to an oral appliance, and more specifically, to an oral appliance enabling comfortable oral motor exercises while being effectively fastened to teeth by applying differing degrees of fastening to teeth to its incisor part and molar part. In the oral appliance and method for manufacturing the same according to the present invention, different degrees of fastening are applied to the incisor part and the molar part, thereby minimizing the user's inconvenience that arises when the user moves mouth while keeping the oral appliance stably fastened to the teeth.