An optical module holder in which an optical transmission line attaching section for attaching an end section of a light transmission line, a photoelectric element attaching section for attaching a photoelectric element including at least one of a light-emitting element or a light-receiving element, and a wall section connecting the optical transmission line attaching section and the photoelectric element attaching section are formed integrally, and a lens for optically joining the photoelectric element and the optical transmission line is formed integrally with the wall section, so that the convex surface of the lens is on the photoelectric element side, facing the photoelectric element attached to the photoelectric attaching section, wherein one or a plurality of concave sections are formed as grooved sections on the wall section so as to surround the lens.