Method for folding a side airbag, characterised in that - in a method step, a first and a second material layer (11.1, 11.2) is provided to form a gas bag having at least one gas-inflatable chamber, wherein - In the inflated state of the airbag, the first material layer (11.1) extends in the vehicle longitudinal direction (x-direction) and the second material layer (11.2) is opposite the first material layer (11.1) and wherein the first and second material layers (11.1, 11.2) are interconnected along at least one respective first edge portion (11.11, 11.21), - in the inflated state of the airbag, the first and second material layers (11.1, 11.2) are formed on the one hand each with a first edge portion (11.11, 11.21), extending in the vehicle vertical direction (z-direction), and on the other hand each with a second edge portion (11.12, 11.22), extending in the plane spanned by vehicle's longitudinal direction (x-direction) and vehicle's transverse direction (y-direction), - the first and second material layers (11.1, 11.2) on the one hand are connected along each of a first edge portion (11.11, 11.21) by means of a first seam partially delimiting chamber and on the other hand is connected via a second seam extending transversely to the first seam and in addition to the first seam delimiting the chamber along second edge portions (11.2, 11.21), - In a further process step, the two layers of material (11.1, 11.2) are placed flat on each other, wherein the portion of the second seam under the formation of a tip in a first direction in the interior of the airbag is turned over, - in a further process step, the end opposite the tip of the two material layers (11.1, 11.2) in the first direction is knocked in multiple times, - in a further process step, the tip is turned over and the turned over portion in the first direction is turned into the interior of the airbag, - in a further process step, a gas generator in the first direction is inserted inside the two material layers (11.1, 11.2), and - in a further process step, starting with the end opposite the gas generator, rolling and folding is performed in a second direction extending transversely to the first direction. - in a method step, a first and a second material layer (11.1, 11.2) is provided to form a gas bag having at least one gas-inflatable chamber, wherein - In the inflated state of the airbag, the first material layer (11.1) extends in the vehicle longitudinal direction (x-direction) and the second material layer (11.2) is opposite the first material layer (11.1) and wherein the first and second material layers (11.1, 11.2) are interconnected along at least one respective first edge portion (11.11, 11.21), - in the inflated state of the airbag, the first and second material layers (11.1, 11.2) are formed on the one hand each with a first edge portion (11.11, 11.21), extending in the vehicle vertical direction (z-direction), and on the other hand each with a second edge portion (11.12, 11.22), extending in the plane spanned by vehicle's longitudinal direction (x-direction) and vehicle's transverse direction (y-direction), - the first and second material layers (11.1, 11.2) on the one hand are connected along each of a first edge portion (11.11, 11.21) by means of a first seam partially delimiting chamber and on the other hand is connected via a second seam extending transversely to the first seam and in addition to the first seam delimiting the chamber along second edge portions (11.2, 11.21), - In a further process step, the two layers of material (11.1, 11.2) are placed flat on each other, wherein the portion of the second seam under the formation of a tip in a first direction in the interior of the airbag is turned over, - in a further process step, the end opposite the tip of the two material layers (11.1, 11.2) in the first direction is knocked in multiple times, - in a further process step, the tip is turned over and the turned over portion in the first direction is turned into the interior of the airbag, - in a further process step, a gas generator in the first direction is inserted inside the two material layers (11.1, 11.2), and - in a further process step, starting with the end opposite the gas generator, rolling and folding is performed in a second direction extending transversely to the first direction.