The present invention relates to an automatic exposure adjusting device for a camera or the like, comprising a single photometric mechanism capable of measuring the light corresponding to the light amount entering into a photosensitive material such as film, the first light amount control mechanism driven in accordance with the output of the photometric mechanism for controlling the light amount over the range of the ordinary brightness and the second light amount control mechanism capable of operating in accordance with the output of the photometric mechanism beyond the operation range of the first light amount control mechanism, whereby for the brightness of the object beyond the range of the ordinary brightness the second light amount control mechanism is automatically operated in accordance with the output of the photometric mechanism so as to give a proper exposure.