A vibration power generator comprising: a first substrate and a second substrate configured to be moved relative to each other by external vibration while remaining opposite each other; a group of a plurality of electrets arranged in the relative movement direction on one surface side of the first substrate; and first and second output terminals (6A, 7A) configured for being connected to at least one power supply load (10, 10', 11), and a group of a plurality of electrodes arranged in the relative movement direction on a surface side of the second substrate opposite to the group of electrets, the group of electrodes including first current collecting electrodes and second current collecting electrodes, the first current collecting electrodes being electrically connected to the first output terminal and the second current collecting electrodes being electrically connected to the second output terminal for supplying power generated by the external vibration to the at least one power supply load (10, 10', 11), characterized in that the group of electrodes further includes at least one ground electrode corresponding to at least one pair of current collecting electrodes (6, 7) from pairs of current collecting electrodes arranged on the second substrate, the pair of current collecting electrodes each comprising one first current collecting electrode and one second current collecting electrode arranged adjacent to one another, wherein the ground electrode is provided between the first current collecting electrode and the second current collecting electrode constituting the pair corresponding to the ground electrode and grounded. a first substrate and a second substrate configured to be moved relative to each other by external vibration while remaining opposite each other; a group of a plurality of electrets arranged in the relative movement direction on one surface side of the first substrate; and first and second output terminals (6A, 7A) configured for being connected to at least one power supply load (10, 10', 11), and a group of a plurality of electrodes arranged in the relative movement direction on a surface side of the second substrate opposite to the group of electrets, the group of electrodes including first current collecting electrodes and second current collecting electrodes, the first current collecting electrodes being electrically connected to the first output terminal and the second current collecting electrodes being electrically connected to the second output terminal for supplying power generated by the external vibration to the at least one power supply load (10, 10', 11), characterized in that the group of electrodes further includes at least one ground electrode corresponding to at least one pair of current collecting electrodes (6, 7) from pairs of current collecting electrodes arranged on the second substrate, the pair of current collecting electrodes each comprising one first current collecting electrode and one second current collecting electrode arranged adjacent to one another, wherein the ground electrode is provided between the first current collecting electrode and the second current collecting electrode constituting the pair corresponding to the ground electrode and grounded.