Vehicle frame structure

A vehicle frame structure comprising:

• a frame-shaped rear section frame main body portion that is integrally formed by casting to include a front section cross portion that connects rear end portions of rear wheelhouse portions to each other in a vehicle width direction, a rear section cross portion that is positioned further toward a vehicle rear side than the front section cross portion and that extends in the vehicle width direction, and a left and right pair of side member portions that connect end portions of the front section cross portion and the rear section cross portion to each other in a vehicle front-rear direction;
• a front-rear coupling portion that is disposed further toward a vehicle width direction inner side than the side member portions in the rear section frame main body portion and that connects the front section cross portion and the rear section cross portion in the vehicle front-rear direction;
• and
• a belt attachment portion that is provided at the front-rear coupling portion and to which a seatbelt is fixed.