A body frame structure forming a side part of an automobile, the body frame structure comprising: an outer panel (12, 52); an inner panel (14, 54) facing the outer panel (12, 52) to form a closed space elongated in a first direction between the inner panel (14, 54) and the outer panel (12, 52); a first reinforcement (18, 56) made of a metal, the first reinforcement being disposed within the closed space; a second reinforcement (22, 60) made of a resin, the second reinforcement being disposed within the closed space; and a foam (20, 58) disposed within the closed space, the closed space including, in at least a portion in the first direction, a three-layer structure (26, 62) including the first reinforcement (18, 56), the second reinforcement (22, 60), and the foam (20, 58) filling a gap between the first reinforcement (18, 56) and the second reinforcement (22, 60), wherein the inner panel and the outer panel form a pillar extending in a height direction of the automobile, the body frame structure further comprises a third reinforcement made of a metal, the third reinforcement being disposed within the closed space, and in at least a portion of the closed space in the first direction, the third reinforcement is disposed opposite the first reinforcement, with the foam being interposed between the third reinforcement and the first reinforcement, characterized in that in at least a portion of the closed space in the height direction, the first reinforcement has a cross section having a substantially hat shape with a center portion in a pillar width direction protruding toward the third reinforcement, and the foam fills a gap between a top surface portion of the hat shape of the first reinforcement and the third reinforcement. an outer panel (12, 52); an inner panel (14, 54) facing the outer panel (12, 52) to form a closed space elongated in a first direction between the inner panel (14, 54) and the outer panel (12, 52); a first reinforcement (18, 56) made of a metal, the first reinforcement being disposed within the closed space; a second reinforcement (22, 60) made of a resin, the second reinforcement being disposed within the closed space; and a foam (20, 58) disposed within the closed space, the closed space including, in at least a portion in the first direction, a three-layer structure (26, 62) including the first reinforcement (18, 56), the second reinforcement (22, 60), and the foam (20, 58) filling a gap between the first reinforcement (18, 56) and the second reinforcement (22, 60), wherein the inner panel and the outer panel form a pillar extending in a height direction of the automobile, the body frame structure further comprises a third reinforcement made of a metal, the third reinforcement being disposed within the closed space, and in at least a portion of the closed space in the first direction, the third reinforcement is disposed opposite the first reinforcement, with the foam being interposed between the third reinforcement and the first reinforcement, characterized in that in at least a portion of the closed space in the height direction, the first reinforcement has a cross section having a substantially hat shape with a center portion in a pillar width direction protruding toward the third reinforcement, and the foam fills a gap between a top surface portion of the hat shape of the first reinforcement and the third reinforcement.