As for endoscope device 8, the endoscope picture the territory divided section around calculating 51 which, is divided into the central territory and the peripheral territory and peripheral brightness mean value brightness mean value calculation section the brightness mean value calculation section on the basis of the ratio of 58 which possesses the central brightness mean value calculation section 52 which calculates 55 and central brightness mean value and central brightness mean value and peripheral brightness mean value 1st weight factor (however, 0< <1) (1- ) it multiplied in value and the peripheral brightness mean value which multiply 1st weight factor in the 1st weight factor calculation section 53 which is calculated and central brightness mean valueThe brightness adjustment control section 70 which forms the brightness adjustment control signal in order to adjust the brightness of the endoscope picture value and, on the basis of total value, the 1st photometry value calculation section 54 which calculates 1st photometry value and, on the basis of 1st photometry value and, it possesses.内視鏡装置8は、内視鏡画像を中央領域と周辺領域とに分割する領域分割部51と、周辺明るさ平均値を算出する周辺明るさ平均値算出部55および中央明るさ平均値を算出する中央明るさ平均値算出部52を有する明るさ平均値算出部58と、中央明るさ平均値と周辺明るさ平均値との比率にもとづいて第1の重み付け係数α(但し、0<α<1)を算出する第1の重み付け係数算出部53と、中央明るさ平均値に第1の重み付け係数αを乗じた値と、周辺明るさ平均値に(1―α)を乗じた値と、の合計値にもとづいて、第1の測光値を算出する第1の測光値算出部54と、第1の測光値にもとづいて内視鏡画像の明るさを調整するための明るさ調整制御信号を生成する明るさ調整制御部70と、を具備する。
