Optical fiber guide structure and optical fiber connecting structure

An optical fiber guide structure includes a guide member uprightly provided on a connection surface of an optical waveguide device and forming a space for housing a tip of an optical fiber when the optical fiber is connected to the optical waveguide device. The guide member is made of a photocurable resin. On the plane perpendicular to the direction in which the optical fiber is inserted into the space, the diameter of an inscribed circle within an inner wall of the guide member configured to form the space is substantially identical to the outer diameter of the optical fiber. The center of the inscribed circle coincides with the center of the core exposed from the connection surface of the optical waveguide device when viewed in the direction in which the optical fiber is inserted.