A hooking device includes a hook for clasping a latching device, a spring mounted to the hook for providing a restoration force to the hook, and a base securing the hook and the spring thereon. The hook includes a main portion, a catch portion, and a pair of shaft portions extending from the other end along opposite direction. The spring includes two winding portions, two first arms extending from ends of the winding portions, the first arms acting on the hook; and two second arms extending from the other ends of the winding portions. The base includes a base plate defining an opening, two supporting plates accommodating the shaft portions, two bearing plates extending from the base plate, the second arms acting on the bearing plate, and an elastic arm extending from the base plate pushing on the other end of the main portion of the hook.