The invention relates to a stress indicator. The inside of the indicator is provided with a magnet; and through interaction between magnetic force of the magnet and acceleration of gravity, inertia force, collision stress and other acting forces produced when the indicator falls off, a result of the change of intrinsic state of the magnet after interaction is observed so as to judge whether a product has drop or collision stress in the transportation process or the use process, for example, a mobile phone or PDA is damaged caused by the drop or collision stress in the use process or transportation process, according to the display of the change of a referent of the stress indicator, whether the product has indication of drop or collision stress can be inferred so as to know ascription of drop responsibility.