An anti-shake apparatus of a photographing apparatus comprises a movable-unit and a fixed-unit. The movable-unit has an imaging-device and is movable in first and second directions. The fixed-unit slidably supports the movable-unit in both the first and second directions. The movable-unit has a horizontal hall-element for detecting a first location in the first direction of the movable-unit, and a vertical hall-element for detecting a second location in the second direction of the movable-unit. The fixed-unit has a magnet unit which is used for detecting the first and second locations, and which has first and second horizontal magnets and first and second vertical magnets. The polarities of the first and second horizontal magnets are arranged in opposite directions, in the third direction. N-pole of the first horizontal magnet and S-pole of the second horizontal magnet are separated in the first direction by a first distance, and face the horizontal hall-element.