An image processing device comprising: - first and second zoom lenses (21A, 21B); - first and second focus lenses (23A, 23B); - an optical axis correction control portion (41A, 41,B) configured to set first and second extraction areas (TA1, TB1) with respect to first and second image signals (V3A, V3B) that are captured by first and second imaging units (3A, 3B) to compensate for an optical misalignment between the first imaging unit and the second imaging unit caused by zoom adjustment of the first and second zoom lenses (21A, 21B), respectively; - an extraction area signal generation portion (83A, 83B) configured to generate first and second extraction area signals (STA1, STB1) expressing the position and size of the first and second extraction areas (TA1, TB1), respectively; - a detection area control portion (84A, 84B) receiving first and second extraction area signals (STA1, STB1) and being configured to set, in accordance with the first and second extraction area signals (STA1, STB1), first and second detection areas (DA1, DB1) in a position at the center of the first and second extraction areas (TA1, TB1), respectively; - a sharpness detection portion (52A1, 52B1) configured to generate sharpness signals (SSA, SSB) by performing arithmetic processing on pixel values of pixels included in the first and second detection areas (DA1, DB1), respectively; and - a lens control portion configured to control a position of the first and second focus lenses (23A, 23B) based on the sharpness signals (SSA, SSB) such that the sharpness of the section corresponding to the first and second detection areas (DA1, DB1) is highest, respectively. - first and second zoom lenses (21A, 21B); - first and second focus lenses (23A, 23B); - an optical axis correction control portion (41A, 41,B) configured to set first and second extraction areas (TA1, TB1) with respect to first and second image signals (V3A, V3B) that are captured by first and second imaging units (3A, 3B) to compensate for an optical misalignment between the first imaging unit and the second imaging unit caused by zoom adjustment of the first and second zoom lenses (21A, 21B), respectively; - an extraction area signal generation portion (83A, 83B) configured to generate first and second extraction area signals (STA1, STB1) expressing the position and size of the first and second extraction areas (TA1, TB1), respectively; - a detection area control portion (84A, 84B) receiving first and second extraction area signals (STA1, STB1) and being configured to set, in accordance with the first and second extraction area signals (STA1, STB1), first and second detection areas (DA1, DB1) in a position at the center of the first and second extraction areas (TA1, TB1), respectively; - a sharpness detection portion (52A1, 52B1) configured to generate sharpness signals (SSA, SSB) by performing arithmetic processing on pixel values of pixels included in the first and second detection areas (DA1, DB1), respectively; and - a lens control portion configured to control a position of the first and second focus lenses (23A, 23B) based on the sharpness signals (SSA, SSB) such that the sharpness of the section corresponding to the first and second detection areas (DA1, DB1) is highest, respectively.