A latching device and an electronic device using the latching device are provided. The latching device is for fastening a cover assembly of the electronic device to a base assembly. The latching device includes a sliding member movably mounted in the cover assembly, a magnet fixed in the sliding member, and a hooking member pivotally fixing on the base assembly. The hooking member is made up of magnetic material. When the cover assembly is rotated to cover the base assembly, the hooking member is attracted by the magnet and hooks onto the cover assembly. When the sliding member slides, the sliding member pushes the hooking member to disengage from the cover assembly.