It suppresses halation without lowering the light distribution performance to perform a good observation. Provided at the distal end of the insertion section of the endoscope apparatus (1), an imaging optical system for observing an observation target (3), provided at a distal end of the insertion portion (1), the illumination light emitted from the light source The plurality of illumination optical system for light distribution in the observation target (2), provided with, at the tip face of the insertion portion (1), each of said illuminating optical system (2) an imaging optical system (3) and the following To provide an endoscope apparatus which is arranged so as to satisfy conditional expression (1). 1 ≦ φ 2 / g (ω, R) 2 ≦ 30 ··· (1) Here, φ is the external diameter of the distal end surface of the insertion portion 1, g (ω, R), said at distal end surface, said imaging optical system (3) Distance to the imaging optical system to the outer edge of the distal end face as the center of the said illuminating optical system (2) from the center of (3 the lens surface effective diameter range obtained by dividing the in) (R) and an optical axis direction of the viewing distance determined from the angle of view and the (ω) of the imaging optical system (3).配光性能を低下させることなくハレーションを抑制し良好な観察を行う。内視鏡装置の挿入部(1)の先端に設けられ、観察対象を観察するための撮像光学系(3)と、前記挿入部(1)の先端に設けられ、光源から出射された照明光を前記観察対象に配光する複数の照明光学系(2)と、を備え、前記挿入部(1)の先端面において、各前記照明光学系(2)と撮像光学系(3)とが次の条件式(1)を満たすように配置されている内視鏡装置を提供する。1≦φ2/g(ω,R)2≦30 ・・・ (1)ここで、φは挿入部1の先端面の外径であり、g(ω,R)は、前記先端面において、前記撮像光学系(3)の中心から当該前記照明光学系(2)の中心を通り前記先端面の外縁までの距離に前記撮像光学系(3)のレンズ面の有効径を除した距離(R)と撮像光学系(3)の画角(ω)とから定まる光軸方向の観察距離である。
