To provide an optical junction structure, minimizing the loss in the transmission of light to a photoreceptor from a light source, while easing the alignment accuracy of the photoreceptor and the optical conductor.

In an optical junction structure comprising a bonding member 602 bonding an optical conductor 601 with a photoreceptor 603, an angle γ formed by a normal 604 on the side surface of a connecting member as viewed at an angle of 90°-β or larger to the lower end surface when viewed from the point (a) at the outer periphery of the lower end surface and a travelling direction 605 of the light is between 90° and 180°, when the angle of incidence of the light from the point (a) on the outer periphery of the lower end surface of the optical conductor 601 to the bonding member 602 is β.