Rotating body load measuring device

A rotating body load measuring device for detecting a force acting on a rotating body that is formed in a columnar shape and rotates around a central axis of a shaft body protruding from a center of each of both end faces, in a state where a main load is applied to the rotating body in a first direction that is one direction in a radial direction, the rotating body load measuring device comprising:

• a first support section which supports one end portion of the shaft body, which protrudes from one end face of the rotating body, so as to be immovable in the first direction and a second direction along the central axis;
• a second support section which supports the other end portion of the shaft body, which protrudes from the other end face of the rotating body, so as to be immovable in the first direction and movable in the second direction;
• and
• a measuring part capable of measuring a force acting in the first direction on at least one of the first support section and the second support section from the shaft body and capable of measuring a force acting in the second direction on the first support section from the shaft body.