A lens component that disperses light from a light source having a light distribution characteristic in which luminosity becomes smaller according to a distance from an optical axis, the lens component comprising: a light incidence portion that has an incidence surface stricken by light from the light source placed at a predetermined light-source position; and a plurality of light guiding portions (24A-24K) that branch from the light incidence portion and that extend radially with respect to the light-source position, each of the light guiding portions (24A-24K) including: a basal end portion joined to the light incidence portion; an emission end portion that emits light outwardly away from the light source; and a light-guide reflection surface that guides light that has stricken the basal end portion from the light incidence portion to the emission end portion while performing internal reflection, the light incidence portion and the plurality of light guiding portions (24A-24K) forming a light distribution structure, the light distribution structure being arranged so that a ratio of luminosity in a predetermined direction making a predetermined angle with the optical axis with respect to luminosity in a direction along the optical axis in light emitted from the light distribution structure is larger than a corresponding ratio in the light distribution characteristic of the light source, characterized in that the incidence surface includes a plurality of incidence regions (34A-34K) that are disposed so as to face the basal end portions of the plurality of light guiding portions (24A-24K), respectively, and that gather light from the light source or convert light from the light source into parallel light and then let the light to enter a corresponding one of the light guiding portions (24A-24K), wherein the plurality of incidence regions (34A-34K) include: a first incidence region; and a second incidence region that is disposed farther from the optical axis than the first incidence region and that is wider than the first incidence region. a light incidence portion that has an incidence surface stricken by light from the light source placed at a predetermined light-source position; and a plurality of light guiding portions (24A-24K) that branch from the light incidence portion and that extend radially with respect to the light-source position, each of the light guiding portions (24A-24K) including: a basal end portion joined to the light incidence portion; an emission end portion that emits light outwardly away from the light source; and a light-guide reflection surface that guides light that has stricken the basal end portion from the light incidence portion to the emission end portion while performing internal reflection, the light incidence portion and the plurality of light guiding portions (24A-24K) forming a light distribution structure, the light distribution structure being arranged so that a ratio of luminosity in a predetermined direction making a predetermined angle with the optical axis with respect to luminosity in a direction along the optical axis in light emitted from the light distribution structure is larger than a corresponding ratio in the light distribution characteristic of the light source, characterized in that the incidence surface includes a plurality of incidence regions (34A-34K) that are disposed so as to face the basal end portions of the plurality of light guiding portions (24A-24K), respectively, and that gather light from the light source or convert light from the light source into parallel light and then let the light to enter a corresponding one of the light guiding portions (24A-24K), wherein the plurality of incidence regions (34A-34K) include: a first incidence region; and a second incidence region that is disposed farther from the optical axis than the first incidence region and that is wider than the first incidence region. a basal end portion joined to the light incidence portion; an emission end portion that emits light outwardly away from the light source; and a light-guide reflection surface that guides light that has stricken the basal end portion from the light incidence portion to the emission end portion while performing internal reflection, the light incidence portion and the plurality of light guiding portions (24A-24K) forming a light distribution structure, the light distribution structure being arranged so that a ratio of luminosity in a predetermined direction making a predetermined angle with the optical axis with respect to luminosity in a direction along the optical axis in light emitted from the light distribution structure is larger than a corresponding ratio in the light distribution characteristic of the light source, characterized in that the incidence surface includes a plurality of incidence regions (34A-34K) that are disposed so as to face the basal end portions of the plurality of light guiding portions (24A-24K), respectively, and that gather light from the light source or convert light from the light source into parallel light and then let the light to enter a corresponding one of the light guiding portions (24A-24K), wherein the plurality of incidence regions (34A-34K) include: a first incidence region; and a second incidence region that is disposed farther from the optical axis than the first incidence region and that is wider than the first incidence region. a first incidence region; and a second incidence region that is disposed farther from the optical axis than the first incidence region and that is wider than the first incidence region.