A compressed-gas motor comprising a hollow cylinder delimited by a cylinder jacket wall, a rear closure at a rear base of the hollow cylinder, a plunger which is axially movable in the hollow cylinder and which is connected at a front end of the plunger with a drive rod which projects out of the hollow cylinder, wherein the plunger divides the hollow cylinder into two inner chambers, specifically into a back inner chamber of the hollow cylinder being delimited by the plunger, the cylinder jacket wall of the hollow cylinder and the rear closure, and a front inner chamber of the hollow cylinder being delimited by the plunger and the cylinder jacket wall of the hollow cylinder and a front base of the hollow cylinder, at least one compressed-gas port, which leads into the back inner chamber of the hollow cylinder, at least one ventilation opening in the cylinder jacket wall of the hollow cylinder, whereby the back inner chamber of the hollow cylinder is connected or connectable for passage of gas with the surrounding atmosphere during operation of the compressed-gas motor, wherein the at least one ventilation opening is periodically openable towards the back inner chamber by the axially movable plunger during operation of the compressed-gas motor by movement of the plunger, at least one compression spring arranged in the front inner chamber, wherein the at least one compression spring rests during operation of the compressed-gas motor at least temporarily against the front base of the hollow cylinder, and/or at least one tension spring arranged in the back inner chamber, wherein the at least one tension spring is connected with the plunger and with the rear closure of the hollow cylinder, wherein the at least one compression spring urges the plunger to such an extent towards the rear closure and/or the at least one tension spring draws the plunger to such an extent towards the rear closure that the back inner chamber of the hollow cylinder is closed relative to the at least one ventilation opening by the plunger and the back inner chamber is connected with the compressed-gas port when the same pressure prevails in the front inner chamber of the hollow cylinder and in the back inner chamber of the hollow cylinder, and wherein a gap allowing passage of gas is present between the plunger and the cylinder jacket wall of the hollow cylinder, the back inner chamber and the front inner chamber being connected together by said gap for passage of gas. a hollow cylinder delimited by a cylinder jacket wall, a rear closure at a rear base of the hollow cylinder, a plunger which is axially movable in the hollow cylinder and which is connected at a front end of the plunger with a drive rod which projects out of the hollow cylinder, wherein the plunger divides the hollow cylinder into two inner chambers, specifically into a back inner chamber of the hollow cylinder being delimited by the plunger, the cylinder jacket wall of the hollow cylinder and the rear closure, and a front inner chamber of the hollow cylinder being delimited by the plunger and the cylinder jacket wall of the hollow cylinder and a front base of the hollow cylinder, at least one compressed-gas port, which leads into the back inner chamber of the hollow cylinder, at least one ventilation opening in the cylinder jacket wall of the hollow cylinder, whereby the back inner chamber of the hollow cylinder is connected or connectable for passage of gas with the surrounding atmosphere during operation of the compressed-gas motor, wherein the at least one ventilation opening is periodically openable towards the back inner chamber by the axially movable plunger during operation of the compressed-gas motor by movement of the plunger, at least one compression spring arranged in the front inner chamber, wherein the at least one compression spring rests during operation of the compressed-gas motor at least temporarily against the front base of the hollow cylinder, and/or at least one tension spring arranged in the back inner chamber, wherein the at least one tension spring is connected with the plunger and with the rear closure of the hollow cylinder, wherein the at least one compression spring urges the plunger to such an extent towards the rear closure and/or the at least one tension spring draws the plunger to such an extent towards the rear closure that the back inner chamber of the hollow cylinder is closed relative to the at least one ventilation opening by the plunger and the back inner chamber is connected with the compressed-gas port when the same pressure prevails in the front inner chamber of the hollow cylinder and in the back inner chamber of the hollow cylinder, and wherein a gap allowing passage of gas is present between the plunger and the cylinder jacket wall of the hollow cylinder, the back inner chamber and the front inner chamber being connected together by said gap for passage of gas.