A device for moving a lower jaw forward includes an upper teeth mounting portion on which upper teeth of a human body are mountable, a lower teeth mounting portion on which lower teeth of the human body are mountable, a sensing portion capable of sensing information which determines a movement time of the lower teeth mounting portion, and a driving portion capable of moving the lower teeth mounting portion relative to the upper teeth mounting portion according to a sensing result of the sensing portion. The driving portion includes a power portion which provides a force for moving the lower teeth mounting portion and a driving connection portion which connects the power portion to the lower teeth mounting portion.