A correction optical device for correcting an image blur, comprising: a movable member that moves along a plane perpendicular to an optical axis of the correction optical device to change a relative positional relation between a lens and an image sensor which receives light through the lens; and a restriction member that is disposed rotatably about an axis parallel to the optical axis to restrict a movement of the movable member, wherein the restriction member rotates so that a first protrusion formed on the restriction member reciprocates between a restricting position and a releasing position; characterized in that, when the first protrusion is in the restricting position, the first protrusion and a second protrusion formed on the movable member oppose to each other to restrict a movement of the movable member along an opposing direction in which the first and second protrusions (112, 122) oppose to each other; wherein, when the first protrusion is in the releasing position, the first protrusion and the second protrusion do not oppose to each other to release restriction of the movement of the movable member along the opposing direction; wherein the first protrusion and the second protrusion are formed into such shapes that generate a component force (Fa) acting on the first protrusion in a direction from the releasing position toward the restricting position when a force causing the first protrusion and the second protrusion to push against each other along the opposing direction is generated between the first protrusion and the second protrusion; and wherein shapes of the first and second protrusions (112, 122) viewed from a direction of the optical axis are such that a tangent line to the first and second protrusions (112, 122) at a contact point at which the first protrusion is in contact with the second protrusion when the first protrusion is in the restricting position is inclined relative to a straight line which is perpendicular to a straight line connecting the contact point and a rotational center of the restriction member so that the tangent line is closer on a side of the releasing position to the rotational center than on a side of the restricting position. a movable member that moves along a plane perpendicular to an optical axis of the correction optical device to change a relative positional relation between a lens and an image sensor which receives light through the lens; and a restriction member that is disposed rotatably about an axis parallel to the optical axis to restrict a movement of the movable member, wherein the restriction member rotates so that a first protrusion formed on the restriction member reciprocates between a restricting position and a releasing position; characterized in that, when the first protrusion is in the restricting position, the first protrusion and a second protrusion formed on the movable member oppose to each other to restrict a movement of the movable member along an opposing direction in which the first and second protrusions (112, 122) oppose to each other; wherein, when the first protrusion is in the releasing position, the first protrusion and the second protrusion do not oppose to each other to release restriction of the movement of the movable member along the opposing direction; wherein the first protrusion and the second protrusion are formed into such shapes that generate a component force (Fa) acting on the first protrusion in a direction from the releasing position toward the restricting position when a force causing the first protrusion and the second protrusion to push against each other along the opposing direction is generated between the first protrusion and the second protrusion; and wherein shapes of the first and second protrusions (112, 122) viewed from a direction of the optical axis are such that a tangent line to the first and second protrusions (112, 122) at a contact point at which the first protrusion is in contact with the second protrusion when the first protrusion is in the restricting position is inclined relative to a straight line which is perpendicular to a straight line connecting the contact point and a rotational center of the restriction member so that the tangent line is closer on a side of the releasing position to the rotational center than on a side of the restricting position.