A method for manufacturing a sheet-shaped fiber-reinforced resin material impregnated with a resin between cut fiber bundles, comprising: a coating step of coating a first sheet (S11, S21) conveyed in a predetermined direction with the resin; a cutting step of cutting an elongated fiber bundle with a cutting machine (113A, 213A); a scattering step of dispersing cut fiber bundles and scattering the cut fiber bundles on the resin; and an impregnating step of pressing a scattered fiber bundle group and the resin on the first sheet to impregnate the resin between the fiber bundles, wherein the method further comprises an inspecting step of inspecting a fiber orientation state of the fiber bundle group scattered on the resin, wherein the inspecting step includes: an imaging step of separately irradiating the fiber bundle group with first light and second light obliquely from an upper side in directions intersecting with each other as viewed in a plan view and capturing a still image of an upper surface of the fiber bundle group at a state of being irradiated with the first light or the second light; and an orientation determining step of calculating a luminance difference or a luminance ratio between a luminance in the state of being irradiated with the first light and a luminance in the state of being irradiated with the second light and determining the fiber orientation state of the fiber bundle group on the basis of luminance information obtained from the still image captured in the imaging step. a coating step of coating a first sheet (S11, S21) conveyed in a predetermined direction with the resin; a cutting step of cutting an elongated fiber bundle with a cutting machine (113A, 213A); a scattering step of dispersing cut fiber bundles and scattering the cut fiber bundles on the resin; and an impregnating step of pressing a scattered fiber bundle group and the resin on the first sheet to impregnate the resin between the fiber bundles, wherein the method further comprises an inspecting step of inspecting a fiber orientation state of the fiber bundle group scattered on the resin, wherein the inspecting step includes: an imaging step of separately irradiating the fiber bundle group with first light and second light obliquely from an upper side in directions intersecting with each other as viewed in a plan view and capturing a still image of an upper surface of the fiber bundle group at a state of being irradiated with the first light or the second light; and an orientation determining step of calculating a luminance difference or a luminance ratio between a luminance in the state of being irradiated with the first light and a luminance in the state of being irradiated with the second light and determining the fiber orientation state of the fiber bundle group on the basis of luminance information obtained from the still image captured in the imaging step. an imaging step of separately irradiating the fiber bundle group with first light and second light obliquely from an upper side in directions intersecting with each other as viewed in a plan view and capturing a still image of an upper surface of the fiber bundle group at a state of being irradiated with the first light or the second light; and an orientation determining step of calculating a luminance difference or a luminance ratio between a luminance in the state of being irradiated with the first light and a luminance in the state of being irradiated with the second light and determining the fiber orientation state of the fiber bundle group on the basis of luminance information obtained from the still image captured in the imaging step.