Disclosed is a protection circuit for a secondary battery and a secondary battery having the same, which can interrupt electric current input into the secondary battery when the temperature of the secondary battery increases due to an overcharge, and also can protect the secondary battery in the case where the already charged secondary battery is exposed to a high temperature due to the increase of an external or internal temperature of the secondary battery. The protection circuit includes: means having one end connected to a first electrode of the secondary battery, for restricting electric current; switching means for connecting a second electrode of the secondary battery to a first outer electrode, or to the current restriction means in response to temperature; and a conducting wire for connecting the first electrode of the secondary battery to a second outer electrode.