A day running lamp includes a laser light source, a light splitting element, a number of light path adjusting elements, a number of scattering elements, and a lampshade. The laser light source is configured for emitting a single laser beam, and the splitting element is configured for splitting the single laser beam into a number of divided beams. Each of the light path adjusting elements is configured for adjusting a light path of corresponding divided beams into parallel beams. The scattering elements are configured for diffusing the parallel divided beams onto the lampshade.