An illumination apparatus for a vehicle daytime running lamp, comprising: multiple light sources; and multiple lens units that are placed correspondingly to the respective multiple light sources, characterized in that, each of the multiple lens units includes a transmission lens that is placed correspondingly to each of the multiple light sources, a first total-reflection lens that is placed in a position adjacent to the transmission lens in a direction parallel to an array direction of the multiple light sources, and a second total-reflection lens that is placed in a position adjacent to the transmission lens in a direction perpendicular to the array direction of the multiple light sources, wherein an incidence surface and an emission surface of the transmission lens are two-axis anamorphic aspherical surfaces, an incidence surface, an emission surface and a total-reflection surface of the first total-reflection lens and the second total-reflection lens are two-axis anamorphic aspherical surfaces, a microlens array is formed on at least one of the incidence surface and the emission surface of the transmission lens, a microlens array is formed on at least one of the emission surfaces, the total-reflection surfaces and the incidence surfaces of the first total-reflection lens and the second total-reflection lens, and the microlens arrays of the transmission lens, the first total-reflection lens and the second total-reflection lens each have a structure in which microlenses are periodically arrayed. multiple light sources; and multiple lens units that are placed correspondingly to the respective multiple light sources, characterized in that, each of the multiple lens units includes a transmission lens that is placed correspondingly to each of the multiple light sources, a first total-reflection lens that is placed in a position adjacent to the transmission lens in a direction parallel to an array direction of the multiple light sources, and a second total-reflection lens that is placed in a position adjacent to the transmission lens in a direction perpendicular to the array direction of the multiple light sources, wherein a transmission lens that is placed correspondingly to each of the multiple light sources, a first total-reflection lens that is placed in a position adjacent to the transmission lens in a direction parallel to an array direction of the multiple light sources, and a second total-reflection lens that is placed in a position adjacent to the transmission lens in a direction perpendicular to the array direction of the multiple light sources, wherein an incidence surface and an emission surface of the transmission lens are two-axis anamorphic aspherical surfaces, an incidence surface, an emission surface and a total-reflection surface of the first total-reflection lens and the second total-reflection lens are two-axis anamorphic aspherical surfaces, a microlens array is formed on at least one of the incidence surface and the emission surface of the transmission lens, a microlens array is formed on at least one of the emission surfaces, the total-reflection surfaces and the incidence surfaces of the first total-reflection lens and the second total-reflection lens, and the microlens arrays of the transmission lens, the first total-reflection lens and the second total-reflection lens each have a structure in which microlenses are periodically arrayed.