A pouch type secondary battery comprising: an electrode assembly having a first electrode plate, a second electrode plate, and a separator; a pouch case made of a flexible material having a conductive core layer and an insulating outer cover layer (22b, 22c), the pouch case comprising a container, which is insulated at least on an inner surface thereof and accommodating the electrode assembly, and sealing portions along an edge of the container, the sealing portions comprising a first sealing portion through which electrode tabs (14, 15) of the electrode assembly extend from the pouch case, and a second sealing portion and a third sealing portion positioned at opposite sides of the first sealing portion, the second and third sealing portions (24b, 24c) being respectively folded at least one time toward opposite sides of the container; a protective circuit module connected to the electrode tabs (14, 15) and mounted on an outer surface of the first sealing portion, an electronic circuit pattern and electronic components being formed on a top portion (30a, 30b) of the protective circuit module; and a short circuit protector comprising cut portions formed by cutting a corner between the first sealing portion and the second sealing portion and a corner between the first sealing portion and the third sealing portion, characterized in that an end of a cut portion is positioned in the second sealing portion and spaced from a border line B between the first sealing portion and the container towards the centre of the second sealing portion, and an end of another cut portion is positioned in the third sealing portion and spaced from the border line between the first sealing portion and the container towards the centre of the third sealing portion,so that electrical contact between the corners among the second and third sealing portions and the electronic circuit pattern and electronic components is prevented. an electrode assembly having a first electrode plate, a second electrode plate, and a separator; a pouch case made of a flexible material having a conductive core layer and an insulating outer cover layer (22b, 22c), the pouch case comprising a container, which is insulated at least on an inner surface thereof and accommodating the electrode assembly, and sealing portions along an edge of the container, the sealing portions comprising a first sealing portion through which electrode tabs (14, 15) of the electrode assembly extend from the pouch case, and a second sealing portion and a third sealing portion positioned at opposite sides of the first sealing portion, the second and third sealing portions (24b, 24c) being respectively folded at least one time toward opposite sides of the container; a protective circuit module connected to the electrode tabs (14, 15) and mounted on an outer surface of the first sealing portion, an electronic circuit pattern and electronic components being formed on a top portion (30a, 30b) of the protective circuit module; and a short circuit protector comprising cut portions formed by cutting a corner between the first sealing portion and the second sealing portion and a corner between the first sealing portion and the third sealing portion, characterized in that an end of a cut portion is positioned in the second sealing portion and spaced from a border line B between the first sealing portion and the container towards the centre of the second sealing portion, and an end of another cut portion is positioned in the third sealing portion and spaced from the border line between the first sealing portion and the container towards the centre of the third sealing portion,so that electrical contact between the corners among the second and third sealing portions and the electronic circuit pattern and electronic components is prevented.