Vehicle-body frame structure

A vehicle-body frame structure comprising a floor tunnel disposed in a vehicle bottom part of a vehicle, the floor tunnel having a U shape, accommodating a vehicle rear part of a transmission and a propeller shaft of the vehicle, and extending in a front-rear direction of the vehicle at a vehicle-widthwise central part, the vehicle-body frame structure comprising:

• a cross member floor front disposed at a vehicle front end of the floor tunnel, the cross member floor front having a vehicle-widthwise cross-sectional shape that includes a first slant, a second slant and a third slant, the first slant extending from the vehicle bottom part toward an inward-and-upward side in a vehicle width direction of the vehicle, the second slant extending from a vehicle upper part of the first slant toward an outward-and-upward side in the vehicle width direction, and the third slant extending from a vehicle upper part of the second slant toward an inward-and-upward side in the vehicle width direction;
• and
• a transmission cross member being fixed to the first slant of the cross member floor front, wherein
• the vehicle rear part of the transmission is mounted on and fixed to the transmission cross member,
• the cross member floor front is formed by joining to each other members divided in a vehicle up-down direction of the vehicle on a vehicle upper side of the second slant, and
• the transmission cross member is fixed to the cross member floor front on a vehicle upper side of the first slant.