Abstract: A buckling device used in conjunction with a strap for holding an object firmly in position is provided. The buckling device includes a male fastener and a female fastener. The male fastener includes a strap-mounting body for fixing a first end of the strap thereto and a tongue-like member formed on the strap-mounting body. The female fastener includes a rectangular body having a hollowed inside and formed with an insertion hole; a locking/releasing piece pivotally mounted on the rectangular body; and an elastic piece provided at the insertion hole. To engage, the tongue-like member on the male fastener is inserted into the insertion hole in the female fastener. The tongue-like member pressed on the elastic piece such that the elastic piece is bent downwards and thereby urges forcibly against the tongue-like member, thereby locking the tongue-like member in position in the female fastener and thus securely engages the male fastener with the female fastener.