Abstract: An oral body device is provided for attaching to and detaching from an oral appliance that has an electrical connection portion. The device includes a body, and an attachment/detachment operation unit that has an electrical connection conductor and is configured to detachably attach the oral appliance to the body portion by operating application and release of force to the oral appliance. Moreover, the attachment/detachment operation unit fixedly attaches the oral appliance in a state in which the electrical connection portion is electrically connected to the electrical connection conductor by applying a force to the oral appliance, and releases the fixation by releasing the force applied to the oral appliance to detach the oral appliance.