An exemplary dot sight device includes a sight body, an illumination unit, an optical system, first, second and third movement blocks, and first, second and third adjustors. The first, second and third movement blocks are disposed in the sight body. The first adjustor is coupled to the first movement block and operable to cause the first movement block to move thereby causing the illumination unit to be displaced along a first axial direction. The second adjustor is coupled to the second movement block and operable to cause the second movement block to move thereby causing the illumination unit to be displaced along a second axial direction different than the first axial direction. The third adjustor is coupled to the third movement block and operable to cause the third movement block to move thereby causing the illumination unit to be displaced along the second axial direction.