A battery module comprising: a pair of cylindrical battery cells each comprising a positive (+) electrode terminal and a negative (-) electrode terminal which face different directions and are arranged to be in close contact with or adjacent to each other; a pair of PTC elements each provided to the positive (+) electrode terminal and the negative (-) electrode terminal which are on one side of the pair of cylindrical battery cells; a connection member configured to electrically connect the positive (+) electrode terminal and the negative (-) electrode terminal which are on the other side of the pair of cylindrical battery cells; characterized in that a connector, comprising a thermistor (144_1), is connected to the pair of battery cells, the connector having a structure in which four wires are connected to a single connection terminal and configured to electrically connect an external system and the pair of cylindrical battery cells via the connection terminal; and a coupling valley provided in a region in which the pair of cylindrical battery cells are coupled to be in close contact with or adjacent to each other, wherein the PTC elements and the four wires are provided in the coupling valley, wherein the connector comprising: a first wire connected to the PTC element provided to the positive (+) electrode terminal; a second wire connected to the connection member; and third and fourth wires which are formed as two wires and connected to the PTC element provided to the negative (-) electrode terminal through a bonding part (144_2) formed on a portion of one wire among the two wires. a pair of cylindrical battery cells each comprising a positive (+) electrode terminal and a negative (-) electrode terminal which face different directions and are arranged to be in close contact with or adjacent to each other; a pair of PTC elements each provided to the positive (+) electrode terminal and the negative (-) electrode terminal which are on one side of the pair of cylindrical battery cells; a connection member configured to electrically connect the positive (+) electrode terminal and the negative (-) electrode terminal which are on the other side of the pair of cylindrical battery cells; characterized in that a connector, comprising a thermistor (144_1), is connected to the pair of battery cells, the connector having a structure in which four wires are connected to a single connection terminal and configured to electrically connect an external system and the pair of cylindrical battery cells via the connection terminal; and a coupling valley provided in a region in which the pair of cylindrical battery cells are coupled to be in close contact with or adjacent to each other, wherein the PTC elements and the four wires are provided in the coupling valley, wherein the connector comprising: a first wire connected to the PTC element provided to the positive (+) electrode terminal; a second wire connected to the connection member; and third and fourth wires which are formed as two wires and connected to the PTC element provided to the negative (-) electrode terminal through a bonding part (144_2) formed on a portion of one wire among the two wires. a first wire connected to the PTC element provided to the positive (+) electrode terminal; a second wire connected to the connection member; and third and fourth wires which are formed as two wires and connected to the PTC element provided to the negative (-) electrode terminal through a bonding part (144_2) formed on a portion of one wire among the two wires.