Abstract: A first aspect of the present invention is carbon fiber wherein the surface of a monofilament has a center line average roughness Ra of 6.0 nm or more and 13 nm or less, and the monofilament has a long diameter/short diameter ratio of 1.11 or more and 1.245 or less. A second aspect of the present invention is carbon fiber precursor acrylic fiber wherein the surface of a monofilament has a center line average roughness Ra of 18 nm or more and 27 nm or less, and the monofilament has a long diameter/short diameter ratio of 1.11 or more and 1.245 or less. The carbon fiber according to the first aspect is obtained by stabilizing and carbonizing under specific conditions the carbon fiber precursor acrylic fiber according to the second aspect.

Abstract: An inverter unit at an end portion of a motor in a rotation shaft direction, the motor includes a conductive member electrically connected to the inverter unit, the inverter unit includes a control component connected to the conductive member and configured to control driving of the motor, the conductive member extends from the end portion of the motor along a rotation shaft of the motor in a state of being adjacent to the rotation shaft, and the control component is disposed on a radially outer side of the conductive member.