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 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 in a direction opposite to torque around the first axis which is generated by a gravitational force applied to the robot arm, between a first angular position and a second angular position which is greater in inclination with respect to a vertical direction than the first angular position 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 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 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 extends, wherein the region extends between two planes perpendicular to the first axis and containing the bearing member, wherein a spacing formed between the second axis and the third axis in a state in which the robot arm is at the second angular position is greater than a spacing formed between the second axis and the third axis in a state in which the robot arm is at the first angular position, 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 toward the second angular position, 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 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 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 extends, wherein the region extends between two planes perpendicular to the first axis and containing the bearing member, wherein a spacing formed between the second axis and the third axis in a state in which the robot arm is at the second angular position is greater than a spacing formed between the second axis and the third axis in a state in which the robot arm is at the first angular position, 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 toward the second angular position, and wherein the balance torque is generated by a reactive force generated by compression of the working fluid.