A pouch-type secondary battery comprising: an electrode assembly including a cathode plate and an anode plate with a separator interposed therebetween, a pouch case made up of an upper pouch and a lower pouch which are constructed in an aluminum pouch type in which an aluminum thin film is interposed between an insulating layer and an adhesive layer made of polymer, and having sealing parts provided along the periphery of the upper pouch and the lower pouch adhered to each other, the pouch case receiving the electrode assembly; electrode tabs protrusively formed on the cathode plate and the anode plate respectively; and an electrode lead for electrically connecting the electrode assembly to an outside of the case, the electrode lead comprising: an inner lead interposed between sealing parts of the upper pouch and the sealing parts of the lower pouch, to which an electrode tab of the electrode assembly is attached, and having a gas flow path formed to allow gas to move between inside and outside of the case; and an outer lead constructed to be inserted into the gas flow path and electrically connected to the inner lead when inserted into the gas flow path, the outer lead which seals one end of the gas flow path and is separated from the gas flow path to cut off the electrical connection with the inner lead when pressure of gas flowed into the gas flow path is higher than or equal to a predetermined pressure. an electrode assembly including a cathode plate and an anode plate with a separator interposed therebetween, a pouch case made up of an upper pouch and a lower pouch which are constructed in an aluminum pouch type in which an aluminum thin film is interposed between an insulating layer and an adhesive layer made of polymer, and having sealing parts provided along the periphery of the upper pouch and the lower pouch adhered to each other, the pouch case receiving the electrode assembly; electrode tabs protrusively formed on the cathode plate and the anode plate respectively; and an electrode lead for electrically connecting the electrode assembly to an outside of the case, the electrode lead comprising: an inner lead interposed between sealing parts of the upper pouch and the sealing parts of the lower pouch, to which an electrode tab of the electrode assembly is attached, and having a gas flow path formed to allow gas to move between inside and outside of the case; and an outer lead constructed to be inserted into the gas flow path and electrically connected to the inner lead when inserted into the gas flow path, the outer lead which seals one end of the gas flow path and is separated from the gas flow path to cut off the electrical connection with the inner lead when pressure of gas flowed into the gas flow path is higher than or equal to a predetermined pressure. an inner lead interposed between sealing parts of the upper pouch and the sealing parts of the lower pouch, to which an electrode tab of the electrode assembly is attached, and having a gas flow path formed to allow gas to move between inside and outside of the case; and an outer lead constructed to be inserted into the gas flow path and electrically connected to the inner lead when inserted into the gas flow path, the outer lead which seals one end of the gas flow path and is separated from the gas flow path to cut off the electrical connection with the inner lead when pressure of gas flowed into the gas flow path is higher than or equal to a predetermined pressure.