A component assembly inspection method includes taking an image of a first light spot group possessed by a first component with a camera after the first component is assembled in a second component, the first light spot group including plural light spots. The method further includes recognizing a position and an attitude of the first component based on a light image that is on the image taken with the camera and represents each of the light spots of the first light spot group; and determining quality of an assembly state of the first component in the second component based on the position and attitude of the first component.