Robot and method for manufacturing robot

A method for manufacturing a robot including a first arm and a second arm rotatably coupled to the first arm, the method comprising:

• coupling a second gear to an input shaft of a decelerator to cause the second gear and the input shaft to rotate around a second axial center, wherein
• the second gear is configured to rotate in conjunction with a first gear configured to rotate around a first axial center of a motor housed in the first arm,
• the first gear is coupled to a rotation shaft configured to rotate around the first axial center,
• the decelerator is configured to decelerate rotation of the input shaft and transmit the decelerated rotation to an output shaft, and includes:
• the input shaft configured to rotate, in conjunction with the second gear, around the second axial center intersecting the first axial center;
• and
• the output shaft coupled to the second arm;
• and
• inserting a tubular member into a first hollow portion and a second hollow portion, wherein
• tubular member is configured to attach to and detach from a housing that rotatably supports the second gear and is coupled to the motor,
• the second gear includes the first hollow portion extending along the second axial center,
• the input shaft includes the second hollow portion extending along the second axial center,
• the first arm includes an opening and a cover configured to close the opening,
• in a state where the second gear and the input shaft are coupled to each other:
• the first hollow portion and the second hollow portion communicate with each other along the second axial center, and
• the housing and an entirety of the motor are exposed through the opening on a side opposite to the decelerator along the second axial center, and
• the tubular member includes a flange portion at one end of the tubular member that is nearer to the opening than the other end of the tubular member.