Pinhole detection device

A pinhole detection device comprising:

• a light source that emits light to an object to be inspected;
• an optical lens disposed between the light source and the object to be inspected;
• and
• a detection unit that detects light that has been converged toward the object to be inspected by the optical lens and passed through a pinhole in the object to be inspected,
• wherein the detection unit includes an optical fiber that transmits the light that has passed through the pinhole in the object to be inspected, and
• wherein when a maximum detectable angle at which the pinhole with respect to an optical axis of the light source is detectable is defined as θ, a maximum angle of incidence of light that can be transmitted by the optical fiber with respect to the optical axis of the light source is in a range of θ+0° to θ+5°.