A battery module comprising: a cell stack structure in which a plurality of battery cells including a first battery cell and a second battery cell neighboring each other are stacked, each battery cell comprising an electrode assembly, a pair of electrode leads, a pouch case and a lead film, the pouch case comprising an accommodation portion and a sealing portion, the sealing portion being formed on the circumference of the pouch case, the sealing portion being located in a direction where an electrode lead is drawn out, being referred to as a terrace portion; the lead film surrounding a part of the electrode lead, and a portion of the lead film being disposed between the electrode lead and the sealing portion, and the remaining portion of the lead film being exposed to the outside of the pouch case; and a bus bar frame assembly combined to at least one side of the cell stack structure and comprising a plurality of lead drawing holes from which electrode leads included in the plurality of battery cells are drawn out, wherein an electrode lead of a first polarity included in the first battery cell and an electrode lead of the first polarity included in the second battery cell are externally drawn out through a same lead drawing hole, and wherein the electrode lead of the first polarity of the first battery cell and the electrode lead of the first polarity of the second battery cell have shapes bent in a same direction at a same location and each comprise a first bent portion formed on a terrace portion and a second bent portion formed in a region where a lead film is formed, wherein a bending direction in the first bent portion and a bending direction in the second bent portion are opposite directions, wherein the bending direction in the first bent portion of the first battery cell is a direction approaching the second battery cell and the bending direction in the second bent portion of the first battery cell is a direction receding from the second battery cell, wherein the bending direction in the first bent portion of the second battery cell is a direction receding from the first battery cell and the bending direction in the second bent portion of the second battery cell is a direction approaching the first battery cell, wherein bending angles (θ) of the first bent portion and the second bent portion are 30° to 50°, characterized in that the second bent portion of the first battery cell is formed at a location corresponding to the terrace portion of the second battery cell, wherein the second bent portion of the first battery cell is located further below the first bent portion of the second battery cell, wherein the first bent portion of the second battery cell is formed at a location corresponding to the region where the lead film of the first battery cell is formed. a cell stack structure in which a plurality of battery cells including a first battery cell and a second battery cell neighboring each other are stacked, each battery cell comprising an electrode assembly, a pair of electrode leads, a pouch case and a lead film, the pouch case comprising an accommodation portion and a sealing portion, the sealing portion being formed on the circumference of the pouch case, the sealing portion being located in a direction where an electrode lead is drawn out, being referred to as a terrace portion; the lead film surrounding a part of the electrode lead, and a portion of the lead film being disposed between the electrode lead and the sealing portion, and the remaining portion of the lead film being exposed to the outside of the pouch case; and a bus bar frame assembly combined to at least one side of the cell stack structure and comprising a plurality of lead drawing holes from which electrode leads included in the plurality of battery cells are drawn out, wherein an electrode lead of a first polarity included in the first battery cell and an electrode lead of the first polarity included in the second battery cell are externally drawn out through a same lead drawing hole, and wherein the electrode lead of the first polarity of the first battery cell and the electrode lead of the first polarity of the second battery cell have shapes bent in a same direction at a same location and each comprise a first bent portion formed on a terrace portion and a second bent portion formed in a region where a lead film is formed, wherein a bending direction in the first bent portion and a bending direction in the second bent portion are opposite directions, wherein the bending direction in the first bent portion of the first battery cell is a direction approaching the second battery cell and the bending direction in the second bent portion of the first battery cell is a direction receding from the second battery cell, wherein the bending direction in the first bent portion of the second battery cell is a direction receding from the first battery cell and the bending direction in the second bent portion of the second battery cell is a direction approaching the first battery cell, wherein bending angles (θ) of the first bent portion and the second bent portion are 30° to 50°, characterized in that the second bent portion of the first battery cell is formed at a location corresponding to the terrace portion of the second battery cell, wherein the second bent portion of the first battery cell is located further below the first bent portion of the second battery cell, wherein the first bent portion of the second battery cell is formed at a location corresponding to the region where the lead film of the first battery cell is formed.