PINHOLE DETECTION DEVICE

The problem solved by the present invention is to provide a pinhole detection device with an improved accuracy of detecting pinholes. In a pinhole detection device 10 of the present invention, a detection unit 24 that detects a pinhole 110 generated in an object 100 to be inspected includes a plurality of optical fibers 30 that transmit light that has passed through the object 100 to be inspected. The plurality of optical fibers 30 are arranged side by side while facing a light source 20. When a maximum detectable angle at which the pinhole 110 with respect to an optical axis of the light source 20 is detectable is defined as θ, a maximum angle of incidence of light that can be transmitted by the optical fiber 30 with respect to the optical axis of the light source 20 is set in a range of θ + 0° to θ + 5°.