The utility model relates to an interior illuminating lamp which comprises a lamp body 30 used for being fixed on a vehicle body 11 and a lamp 50 which can be arranged on the supporting section 33 on the lamp body 30 and is movably supported at an angle, the interior illuminating lamp is also provided with a lens 54 which can transmit a light beam from a light source 37, wherein the lamp 50 comprises a first glass frame 52 which can be movably supported at an angle on the supporting body 33 and a second glass frame 53 which can maintain the lens 54 and is arranged on the first glass frame 52; the second glass frame 53 is provided with a reflecting surface 53 which can receive and reflect a transmitted light ray passing through the lens 54, and the reflecting surface is designed into a reflecting surface with a low reflectivity. The light ray reflected by the reflecting surface 55 is not glaring; the light beam entering the vision of a driver through a back view mirror inside a vehicle, thereby, driving is not affected.