A hydraulic rotating machine , comprising: a cylinder block configured to be rotated following rotation of a drive shaft ; plural cylinders formed in the cylinder block and arranged at predetermined intervals in the circumferential direction of the drive shaft ; pistons slidably inserted into the cylinders and configured to partition capacity chambers inside the cylinders ; a swash plate configured to let the pistons reciprocate so that the capacity chambers are expanded and contracted following rotation of the cylinder block ; a first biasing mechanism configured to bias the swash plate in accordance with supplied control pressure; a second biasing mechanism configured to bias the swash plate against the first biasing mechanism ; and a regulator configured to control the control pressure led to the first biasing mechanism in accordance with self-pressure of the hydraulic rotating machine , characterized in that the second biasing mechanism has: a pressure chamber to which the self-pressure is led; and a control piston configured to be biased toward the swash plate by the self-pressure led to the pressure chamber , and the regulator has: a biasing member configured to bias the control piston toward the swash plate ; and a control spool configured to be moved in accordance with biasing force of the biasing member , the control spool being configured to adjust the control pressure. a cylinder block configured to be rotated following rotation of a drive shaft ; plural cylinders formed in the cylinder block and arranged at predetermined intervals in the circumferential direction of the drive shaft ; pistons slidably inserted into the cylinders and configured to partition capacity chambers inside the cylinders ; a swash plate configured to let the pistons reciprocate so that the capacity chambers are expanded and contracted following rotation of the cylinder block ; a first biasing mechanism configured to bias the swash plate in accordance with supplied control pressure; a second biasing mechanism configured to bias the swash plate against the first biasing mechanism ; and a regulator configured to control the control pressure led to the first biasing mechanism in accordance with self-pressure of the hydraulic rotating machine , characterized in that the second biasing mechanism has: a pressure chamber to which the self-pressure is led; and a control piston configured to be biased toward the swash plate by the self-pressure led to the pressure chamber , and the regulator has: a biasing member configured to bias the control piston toward the swash plate ; and a control spool configured to be moved in accordance with biasing force of the biasing member , the control spool being configured to adjust the control pressure. a pressure chamber to which the self-pressure is led; and a control piston configured to be biased toward the swash plate by the self-pressure led to the pressure chamber , and the regulator has: a biasing member configured to bias the control piston toward the swash plate ; and a control spool configured to be moved in accordance with biasing force of the biasing member , the control spool being configured to adjust the control pressure. <EOS>