A working machine, comprising: a rotation body; an electric rotation motor for rotating and driving said rotation body; a hydraulic pump for driving a hydraulic actuator (6, 16) by pressure oil from the hydraulic pump; rotation operation means for sending a rotation signal to said electric rotation motor; hydraulic actuator operation means for sending an action signal to said hydraulic actuator (6, 16); rotation operation amount detecting means for detecting a rotation operation amount which is an operation amount of said rotation operation means; hydraulic actuator operation amount detecting means for detecting a hydraulic actuator operation amount which is an operation amount of said hydraulic actuator operation means; and control means for controlling said electric rotation motor on the basis of the signals from both said rotation and hydraulic actuator operation amount detecting means, the control means including: rotation speed target value calculating means for calculating a rotation speed target value from the rotation operation amount of the rotation operation amount detecting means; limitation value setting means (34, 36) for setting a limitation value based on the hydraulic actuator operation amount of the hydraulic actuator operation amount detecting means to limit calculation of a final rotation torque command value based on the rotation speed target value, the final rotation torque command value being adapted: to control said electric rotation motor at speed in accordance with the rotation operation amount when no hydraulic action by said hydraulic actuator (6, 16) is performed, and to torque-control said electric rotation motor in the direction of slowing down acceleration of the rotation in accordance with an increase in the hydraulic actuator operation amount at the time of a combined operation for simultaneously performing a rotation action and a hydraulic action by said hydraulic actuator (6, 16). a rotation body; an electric rotation motor for rotating and driving said rotation body; a hydraulic pump for driving a hydraulic actuator (6, 16) by pressure oil from the hydraulic pump; rotation operation means for sending a rotation signal to said electric rotation motor; hydraulic actuator operation means for sending an action signal to said hydraulic actuator (6, 16); rotation operation amount detecting means for detecting a rotation operation amount which is an operation amount of said rotation operation means; hydraulic actuator operation amount detecting means for detecting a hydraulic actuator operation amount which is an operation amount of said hydraulic actuator operation means; and control means for controlling said electric rotation motor on the basis of the signals from both said rotation and hydraulic actuator operation amount detecting means, the control means including: rotation speed target value calculating means for calculating a rotation speed target value from the rotation operation amount of the rotation operation amount detecting means; limitation value setting means (34, 36) for setting a limitation value based on the hydraulic actuator operation amount of the hydraulic actuator operation amount detecting means to limit calculation of a final rotation torque command value based on the rotation speed target value, the final rotation torque command value being adapted: to control said electric rotation motor at speed in accordance with the rotation operation amount when no hydraulic action by said hydraulic actuator (6, 16) is performed, and to torque-control said electric rotation motor in the direction of slowing down acceleration of the rotation in accordance with an increase in the hydraulic actuator operation amount at the time of a combined operation for simultaneously performing a rotation action and a hydraulic action by said hydraulic actuator (6, 16). rotation speed target value calculating means for calculating a rotation speed target value from the rotation operation amount of the rotation operation amount detecting means; limitation value setting means (34, 36) for setting a limitation value based on the hydraulic actuator operation amount of the hydraulic actuator operation amount detecting means to limit calculation of a final rotation torque command value based on the rotation speed target value, the final rotation torque command value being adapted: to control said electric rotation motor at speed in accordance with the rotation operation amount when no hydraulic action by said hydraulic actuator (6, 16) is performed, and to torque-control said electric rotation motor in the direction of slowing down acceleration of the rotation in accordance with an increase in the hydraulic actuator operation amount at the time of a combined operation for simultaneously performing a rotation action and a hydraulic action by said hydraulic actuator (6, 16). to control said electric rotation motor at speed in accordance with the rotation operation amount when no hydraulic action by said hydraulic actuator (6, 16) is performed, and to torque-control said electric rotation motor in the direction of slowing down acceleration of the rotation in accordance with an increase in the hydraulic actuator operation amount at the time of a combined operation for simultaneously performing a rotation action and a hydraulic action by said hydraulic actuator (6, 16).