To make an adjusting space necessary for a photometric block small and to miniaturize a camera by providing a supporting position adjusting member including 1st to 3rd adjusting parts specified respectively.

The photometric block 5 is mounted on a photometric block base 13 through three adjusting machine screws 10 to 12 functioning as the adjusting member by means of three-point adjustment. By rotating the screws 10 and 11 in a reverse direction respectively, the arm parts 5b and 5c of the block 5 are moved up and down in the reverse direction, and only the angle of the block 5 to the optical axis direction of a photometric image-formation lens is changed in directions A and B without changing the position of the photometric imageformation lens in the optical axis direction so as to adjust the block 5 in a right-and-left direction with respect to a focusing screen 2. Thereafter, by moving the screw 12 by setting the machine screw 10 which finishes adjusting action as reference, only the height of the arm part 5d of the block 5 is changed without changing the height of the arm part 5b, and the angle of the block 5 to the optical axis of the photometric image-formation lens is changed in directions C and D so as to adjust the block 5 in an up-and- down direction with respect to the focusing screen 2.