To provide a shadowless lamp capable of obtaining color unevenness suppression effect for a given light source.SOLUTION: A shadowless lamp 1 comprises a light source unit 4, and a main reflection mirror 6 capable of reflecting light of the light source unit 4 to obtain a shadowless effect. The main reflection mirror 6 has a plurality of elliptic reflection surfaces R1 to R5. In a projection image formed by the respective elliptic reflection surfaces R1 to R5, an erect image and an inverted image relatively turning at 180 degrees around an optical axis K with respect to the erect image are included even at any point within a predetermined range W along the optical axis K of the main reflection mirror 6.SELECTED DRAWING: Figure 7【課題】任意の光源に対して色ムラ抑制効果が得られる無影灯を提供すること。【解決手段】光源ユニット４と、前記光源ユニット４の光を反射し無影効果を得る主反射鏡６と、を備え、前記主反射鏡６は、複数の楕円反射面Ｒ１～Ｒ５を有し、前記楕円反射面Ｒ１～Ｒ５のそれぞれが形成する投射像には、前記主反射鏡６の光軸Ｋに沿った所定範囲Ｗのいずれの点においても、正立像と、当該正立像に対して前記光軸Ｋの周りに相対的に１８０度回転した倒立像とが含まれている無影灯１を構成した。【選択図】図７
