A fuel lid opener has: a case that is mounted to an outer peripheral surface of a side wall of a lid box at which a fuel lid is pivotally supported so as to be able to open and close; a lifter that is supported at the case so as to be able to rotate around an axis that runs along a plate surface direction of the fuel lid that is in a closed state, and that has an arm portion that extends in a rotation radial direction within the lid box, and a distal end portion of the arm portion engages with the fuel lid that is in the closed state from a reverse surface side; and a heart cam mechanism that is provided within the case, and that, each time the arm portion of the lifter is push-operated in one direction around the axis via the fuel lid, causes the lifter to alternately repeat rotation in one direction and in another direction around the axis, and that pushes the fuel lid open due to rotation of the lifter in the another direction.