To reduce snore by letting a person with a big snore closed his mouth at unconsciousness during sleep, by winding around a head part 2, both sides of a face 3 and a lower jaw part 4 with an elastic string 1 and pulling the lower jaw up toward an upper jaw.

A head part 2, both sides of a face 3 and a lower jaw part 4 of a body are wound around by an elastic string 1 to pull the lower jaw up toward an upper jaw. The elastic string 1 for the snore-reducing instrument is equipped with a detachable fixture 5 for easily putting on and taking off, a slip-stopper 6 for a head part elastic string and a slip-stopper 7 for a lower jaw elastic string, thus making up a structure preventing the instrument from slipping off with the movement of a body during sleep.