An image stabilizer includes a pair of first parallel guide rods mounted to a stationary member extending in a first direction; a first moving stage supported by the first parallel guide rods to be movable in the first direction; a pair of second parallel guide rods mounted to the first moving stage extending in a second direction orthogonal to the first direction; a second moving stage which holds an image-stabilizing optical element and supported by the second parallel guide rods to be movable in the second direction; first and second biasing devices which bias the first and second moving stages in the first and second directions; first and second driving devices which drive the first and second moving stages in the first and second directions. The pair of first and second parallel guide rods lie in a common plane orthogonal to an optical axis.