Robot arm and robot

A robot arm comprising:

• a plurality of arms that are turnably connected, wherein
• the plurality of arms include a plurality of links and an actuator that turns the plurality of links,
• the actuator includes:
• an outer cover provided on an outer surface of the actuator;
• a motor that turns the plurality of links;
• a motor frame that supports the motor;
• a reduction gear that decelerates rotation from the motor and outputs a torque;
• a collar fixed to the reduction gear;
• and
• a wiring member including at least one of a wire and a pipe,
• at least a part of wiring member is housed between a surface including a first body section formed by the motor frame and the collar and a surface including a second body section of the outer cover, and
• the first body section and the second body section are hourglass-shaped.