Inspection method for optical fiber, inspection device for optical fiber, and method for manufacturing optical fiber-wound bobbin

An inspection device for an optical fiber, the inspection device comprising:

• a light source configured to irradiate, with illumination light having directivity, an outer peripheral surface of a wound body, wherein
• the wound body comprises the optical fiber wound in multiple layers around a bobbin, and
• the optical fiber includes a bare optical fiber and a light-transmitting coating layer that coats an outer peripheral surface of the bare optical fiber;
• an imaging sensor configured to receive the illumination light reflected by the wound body and to generate image data containing at least a part of an image of the illumination light;
• and
• an integrated circuit configured to determine, based on the image data, whether a stripe pattern is projected in the image, wherein
• the stripe pattern is a state in which the illumination light repeatedly changes along a winding direction of the optical fiber.