A cushion frame for use in a vehicle seat includes a side frame extending in a seat front-rear direction, a bracket supporting the side frame and a coupling member. The bracket includes a lower end portion having a fixing portion fixed to a vehicle directly or indirectly. The coupling member is fixed to an upper end portion of the bracket to hold the upper end portion at a position offset in a seat width direction relative to the side frame and to fix the upper end portion to the side frame. A welding region of the coupling member, projected on a virtual plane orthogonal to the seat width direction, extends along an outer periphery of the coupling member in a specified area including an intersection between the outer periphery of the coupling member projected on the virtual plane and a bracket normal line.