Power transmission shaft and method for manufacturing same

A power transmission shaft comprising:

• a tubular body made of metal and having, at an outer peripheral surface thereof, a covered portion that is covered with a coating and, at least at a part of the outer peripheral surface thereof, an uncovered portion that is not covered with the coating;
• and
• a balance weight having a junction formed integrally with the balance weight on an inner side surface, facing the uncovered portion of the tubular body, of the balance weight, wherein at least the inner side surface, except a portion where the junction is formed, of the balance weight is covered with a first cover layer made of sacrificial corrosion prevention material that contains metal whose ionization tendency is higher than that of the metal forming the tubular body,
• wherein the balance weight is fixed to the tubular body with a top end portion of the junction being joined to the uncovered portion of the tubular body.