Abstract: The auxiliary seat belt device of the present invention is an auxiliary seat belt device which is removably secured to a vehicle seat belt that is installed by connecting a buckle and a tongue that is inserted into the buckle. The auxiliary seat belt device of the present invention includes: a first belt, a first fixation member that has a first through hole that is attached to one end of the first belt, and a first fastening member that is attached to the other end of the first belt. Here, the tongue comprises a tongue insert piece that is inserted into the buckle and connected to the buckle. With the buckle insert piece, which passes through the first through hole, inserted in the buckle, the first fixation member, the tongue and the buckle are connected together. The auxiliary seat belt device of the present invention can be easily attached to or detached from an existing seat belt without having to modify the seat belt.

Abstract: A seat belt auxiliary device used for a seat belt that is installed by coupling together a buckle (3, 19) and a tongue (2, 17) inserted into the buckle. The seat belt auxiliary device has a first belt (11), a first fixation member (8, 18) attached to one end of the first belt and having a first through-hole (8a, 18a), and a first fastening member (11d) attached to the other end of the first belt. The tongue has a tongue insert piece (2b, 17b) inserted into the buckle and coupled to the buckle. The first fixation member, the tongue, and the buckle are joined, with the tongue insert piece that passed the first through-hole inserted in the buckle. The seat belt auxiliary device can be used without modifying an existing seat belt and can be easily attached to and detached from the seat belt.