The endoscope apparatus is within a predetermined time, and performs illumination by the illumination light of the first band, the illuminating means to perform a first count illuminate more than once by the illumination light of the second band, said first the color conversion matrix process using the one of the band first second imaging signal based on a predetermined number of illumination of the first image pickup signal and the first number of times based on the illumination by the illumination light of the first calculating a brightness and a second image pickup signal based on said first illumination other than the predetermined times of said first first imaging signal and the first number of times based on the illumination by the illumination light of the band and brightness calculation means for calculating the second brightness by the color conversion matrix process using, said second brightness of the underlying said first and second image pickup signal, the first brightness and target brightness After multiplying a coefficient based on the ratio between the difference and the second brightness Sato, it comprises a combining means for combining the first brightness of the underlying first and second imaging signals.内視鏡装置は、所定の時間内に、第１の帯域の照明光による照明を行うと共に、第２の帯域の照明光による照明を２回以上の第１の回数行う照明手段と、前記第１の帯域の照明光による照明に基づく第１の撮像信号と前記第１の回数のうちの第１の所定回の照明に基づく第２の撮像信号とを用いた色変換マトリクス処理によって第１の明るさを算出し、前記第１の帯域の照明光による照明に基づく第１の撮像信号と前記第１の回数のうちの前記第１の所定回以外の照明に基づく第２の撮像信号とを用いた色変換マトリクス処理によって第２の明るさを算出する明るさ算出手段と、前記第２の明るさの元となる前記第１及び第２の撮像信号に、前記第１の明るさと目標明るさとの差分と前記第２の明るさとの比に基づく係数を乗算した後、前記第１の明るさの元となる前記第１及び第２の撮像信号に合成する合成手段と、を備える。
