A robot comprising robot arm , an arm support section to which a base end portion of the robot arm is mounted via a bearing member having a first axis (L1) extending horizontally as a center axis in such a manner that the robot arm is rotatable, and a balancer device including a gas spring mechanism which causes_the robot arm to generate balance torque around the first axis (L1) in a direction opposite to torque around the first axis (L1) which is generated by a gravitational force applied to the robot arm , between a first angular position (P1) and a second angular position (P2) which is greater in inclination with respect to a vertical direction than the first angular position (P1) is, wherein a first end portion of the balancer device is coupled to a first fastening section which is independent of the robot arm in such a manner that the balancer device is rotatable around a second axis (L2) extending horizontally, wherein a second end portion of the balancer device is coupled to a second fastening section provided at the robot arm in such a manner that the balancer device is rotatable around a third axis (L3) extending horizontally, wherein the balancer device is placed in such a manner that the first end portion and the second end portion are located in a region in which the bearing member is located in a direction in which the first axis (L1) extends, wherein the region extends between two planes perpendicular to the first axis (L1) and containing the bearing member , wherein a spacing formed between the second axis (L2) and the third axis (L3) in a state in which the robot arm is at the second angular position (P2) is greater than a spacing formed between the second axis (L2) and the third axis (L3) in a state in which the robot arm is at the first angular position (P1), wherein the gas spring mechanism is contracted to compress a working fluid , wherein the balancer device comprises a conversion mechanism which contracts the gas spring mechanism , according to a rotation of the robot arm from the first angular position (P1) toward the second angular position (P2), and wherein the balance torque is generated by a reactive force generated by compression of the working fluid . wherein a first end portion of the balancer device is coupled to a first fastening section which is independent of the robot arm in such a manner that the balancer device is rotatable around a second axis (L2) extending horizontally, wherein a second end portion of the balancer device is coupled to a second fastening section provided at the robot arm in such a manner that the balancer device is rotatable around a third axis (L3) extending horizontally, wherein the balancer device is placed in such a manner that the first end portion and the second end portion are located in a region in which the bearing member is located in a direction in which the first axis (L1) extends, wherein the region extends between two planes perpendicular to the first axis (L1) and containing the bearing member , wherein a spacing formed between the second axis (L2) and the third axis (L3) in a state in which the robot arm is at the second angular position (P2) is greater than a spacing formed between the second axis (L2) and the third axis (L3) in a state in which the robot arm is at the first angular position (P1), wherein the gas spring mechanism is contracted to compress a working fluid , wherein the balancer device comprises a conversion mechanism which contracts the gas spring mechanism , according to a rotation of the robot arm from the first angular position (P1) toward the second angular position (P2), and wherein the balance torque is generated by a reactive force generated by compression of the working fluid . <EOS>