Abstract: A fiber-reinforced resin molding material includes at least bundled discontinuous reinforcing fiber aggregates and matrix resin, wherein said bundled reinforcing fiber aggregates include both reinforcing fiber aggregates (A) which are formed by cutting continuous reinforcing fiber strands after fiber splitting, in which said strands are completely split into multiple bundles, and reinforcing fiber aggregates (B) having at least unsplit strand sections in which fiber splitting is incomplete, an incision substantially originating from fiber splitting is present at least at one of both end portions of said reinforcing fiber aggregates (B), and a ratio of the weight of said reinforcing fiber aggregates (B) to the total weight of reinforcing fibers in said material is 5-50%.

Abstract: A fiber-reinforced resin forming material contains at least a matrix resin and bundled aggregates of discontinuous reinforcing fibers, wherein: the bundled aggregates include both reinforcing fiber aggregates A having a shape formed by cutting after having performed a splitting treatment to completely split the strands of continuous reinforcing fibers into a plurality of bundles of strands, and reinforcing fiber aggregates B1 having a shape that includes unsplit parts where splitting treatment was inadequate and/or reinforcing fiber aggregates B2 having a shape not subjected to splitting treatment; and both the ratio of the weight of the reinforcing fiber aggregates B1 with respect to the total weight of reinforcing fibers in the fiber-reinforced resin forming material, and the ratio of the total weight of the reinforcing fiber aggregates B1 and the reinforcing fiber aggregates B2 with respect to the total weight of reinforcing fibers in the fiber-reinforced resin forming material, are 50-95%.

Abstract: A fiber-reinforced resin forming material contains at least a matrix resin and bundled aggregates of discontinuous reinforcing fibers, wherein: the bundled aggregates include both reinforcing fiber aggregates A having a shape formed by cutting after having performed a splitting treatment to completely split the strands of continuous reinforcing fibers into a plurality of bundles of strands, and reinforcing fiber aggregates B1 having a shape that includes unsplit parts where splitting treatment was inadequate and/or reinforcing fiber aggregates B2 having a shape not subjected to splitting treatment; and both the ratio of the weight of the reinforcing fiber aggregates B1 with respect to the total weight of reinforcing fibers in the fiber-reinforced resin forming material, and the ratio of the total weight of the reinforcing fiber aggregates B1 and the reinforcing fiber aggregates B2 with respect to the total weight of reinforcing fibers in the fiber-reinforced resin forming material, are 50-95%.

Abstract: A reinforcing fiber composite material includes at least a matrix resin and discontinuous reinforcing fibers which include discontinuous reinforcing fiber aggregates, wherein the discontinuous reinforcing fibers include at least 5 wt % of discontinuous reinforcing fiber aggregates (A) in each of which a most widened section, where the width of the discontinuous reinforcing fiber aggregate in a direction intersecting the alignment direction of the discontinuous reinforcing fibers is made greatest when the discontinuous reinforcing fiber aggregate is two-dimensionally projected, is present at a position excluding both ends of the discontinuous reinforcing fiber aggregate, and the aspect ratio (width of the discontinuous reinforcing fiber aggregate/thickness of the discontinuous reinforcing fiber aggregate) of the most widened section is 1.3 times or more the aspect ratio of at least one of the ends of the discontinuous reinforcing fiber aggregate.

Abstract: A fiber-reinforced resin molding material includes at least bundled discontinuous reinforcing fiber aggregates and matrix resin, wherein said bundled reinforcing fiber aggregates include both reinforcing fiber aggregates (A) which are formed by cutting continuous reinforcing fiber strands after fiber splitting, in which said strands are completely split into multiple bundles, and reinforcing fiber aggregates (B) having at least unsplit strand sections in which fiber splitting is incomplete, an incision substantially originating from fiber splitting is present at least at one of both end portions of said reinforcing fiber aggregates (B), and a ratio of the weight of said reinforcing fiber aggregates (B) to the total weight of reinforcing fibers in said material is 5-50%.

Abstract: A stampable sheet includes a skin layer and a core layer characterized in that the core layer comprises a thermoplastic resin and a carbon fiber nonwoven sheet having fiber bundles of discontinuous carbon fibers, the carbon fiber nonwoven sheet contains at least five fiber bundles (A) having a bundle width of at least 150 ?m in 100 mm×100 mm of stampable sheet, and the skin layer comprises a thermoplastic resin and a strengthened fiber nonwoven sheet having opened discontinuous strengthened fibers.