An interior illumination lamp includes a body 30 for being fixed to a vehicle body 11, and a lamp 50 which is angularly movably supported on a support portion 33 mounted on the body 30, and has a lens 54 capable of transmitting a beam from a light source 37 therethrough. The lamp 50 includes a first bezel 52 angularly movably supported on the support portion 33, and a second bezel 53 which holds the lens 54, and is mounted on the first bezel 52. The second bezel 53 has a reflecting surface 55 for receiving and reflecting transmitted light through the lens 54, and this reflecting surface is designed to have a low reflectance. By doing so, the light, reflected by the reflecting surface 55, is not glaring, and therefore a beam, coming into the driver's sight via a room mirror, is not glaring, and therefore will not affect the driving operation.