Abstract: A buckle device includes a seat body, a belt body having saw-toothed sections, and a control member. An actuating portion and a linkage portion of the control member are pivotally connected to the seat body through a rotating shaft. The actuating portion and the linkage portion are provided with a first return elastic member and a second return elastic member, respectively. The tops and the bottoms of the actuating portion and the linkage portion are provided with raised blocks and raised teeth to engage with the saw-toothed sections, respectively. The user can pull the actuating portion with one hand for the raised teeth of the actuating portion and the linkage portion to disengage from the saw-toothed sections.