A seatbelt buckle for use in vehicle comprises a base, an intermediate loop, a fixed disc, an elastic member, an upper cover, a fixed post, four movable posts, an actuation member, a biasing element and a pressing element, wherein the intermediate loop and the fixed disc are screwed onto the base, the elastic member is secured between the intermediate loop and the fixed disc, and a plurality of snap-on recesses form between the intermediate loop and the fixed disc for the insertion of engaging members of the seatbelt, the pressing element is constructed in the form of a sheet, and one end thereof extends outwardly and includes a wave-shaped abutting segment arranged thereon, thereby lowering the production cost and saving force during unbuckling the seatbelt.