Abstract: A portable lighter, or particularly a lighter with a safety device is disclosed, in which safety is ensured by using a separate locking device. While a lighter is convenient, the conventional lighter broods the danger that, if it is accidentally lighted, or if a child plays with it, a hellish catastrophe can occur. The present invention is intended to overcome the above described disadvantages of the conventional technique. Therefore it is the object of the present invention to provide a lighter with a safety device, in which the lighter is locked after each use, so that unexpected disaster can be prevented. In achieving the above object, the lighter according to the present invention is characterized in that a pressing button for activating a piezo electric device is prevented from being activated by a locking section, the locking section being for temporarily locking an igniting section. The locking section is activated by the pressing button and a locking member.