A mirror driving device (10, 110, 210) comprising: a mirror unit configured to have a reflection surface to reflect light; a pair of piezoelectric actuator units (14, 16) configured to be disposed at both sides of the mirror unit so as to sandwich the mirror unit; linking units (18, 20) each of which is configured to connect one end of the piezoelectric actuator unit (14, 16) with an end portion of the mirror unit, the end portion of the mirror unit being away from a rotation axis of the mirror unit in a direction which is along the reflection surface and is perpendicular to the rotation axis; and a fixing unit configured to support the other end of the piezoelectric actuator unit (14, 16), wherein each of the linking units (18, 20) is a plate-shaped hinge unit that has a structure including two or more plate-shaped members whose longitudinal direction is a direction that is along the reflection surface and that is perpendicular to the rotation axis, and in the linking units (18, 20), the plate-shaped members are deformed so as to be deflected in a thickness direction by a drive of the piezoelectric actuator unit (14, 16), and each of the linking units (18, 20) is provided with a stress detecting unit (24-i, 125-i, 225-i) that detects a stress to be generated in the linking unit (18, 20) during a rotational drive of the mirror unit by a resonant vibration, the resonant vibration being induced by the drive of the piezoelectric actuator units (14, 16) and involving a rotational motion of the mirror unit; wherein each of the linking units (18, 20) has a structure in which two or more of the plate-shaped members are arrayed so as to be folded back in a meandering form, and at the time of the resonant vibration, adjacently arrayed plate-shaped members are deformed so as to be deflected in opposite directions to each other; characterized in that, when consecutive numbers indicating an array order are given to the two or more of the plate-shaped members arrayed so as to be folded back in the meandering form, from a side close to the mirror unit toward a direction of the piezoelectric actuator unit (14, 16), and thereby, each of the plate-shaped members is identified, the mirror driving device (10, 110, 210) comprises, as the stress detecting unit (24-i), a first stress detecting unit (24-2, 24-3, 125-2, 125-3, 225-2, 225-3) configured to detect a stress to be generated in an odd-numbered plate-shaped member (19-2, 19-3, 219-2, 219-3), and a second stress detecting unit (24-1, 24-4, 125-1, 125-4, 225-1, 225-4) configured to detect a stress to be generated in an even-numbered plate-shaped member (19-1, 19-4, 219-1, 219-4). a mirror unit configured to have a reflection surface to reflect light; a pair of piezoelectric actuator units (14, 16) configured to be disposed at both sides of the mirror unit so as to sandwich the mirror unit; linking units (18, 20) each of which is configured to connect one end of the piezoelectric actuator unit (14, 16) with an end portion of the mirror unit, the end portion of the mirror unit being away from a rotation axis of the mirror unit in a direction which is along the reflection surface and is perpendicular to the rotation axis; and a fixing unit configured to support the other end of the piezoelectric actuator unit (14, 16), wherein each of the linking units (18, 20) is a plate-shaped hinge unit that has a structure including two or more plate-shaped members whose longitudinal direction is a direction that is along the reflection surface and that is perpendicular to the rotation axis, and in the linking units (18, 20), the plate-shaped members are deformed so as to be deflected in a thickness direction by a drive of the piezoelectric actuator unit (14, 16), and each of the linking units (18, 20) is provided with a stress detecting unit (24-i, 125-i, 225-i) that detects a stress to be generated in the linking unit (18, 20) during a rotational drive of the mirror unit by a resonant vibration, the resonant vibration being induced by the drive of the piezoelectric actuator units (14, 16) and involving a rotational motion of the mirror unit; wherein each of the linking units (18, 20) has a structure in which two or more of the plate-shaped members are arrayed so as to be folded back in a meandering form, and at the time of the resonant vibration, adjacently arrayed plate-shaped members are deformed so as to be deflected in opposite directions to each other; characterized in that, when consecutive numbers indicating an array order are given to the two or more of the plate-shaped members arrayed so as to be folded back in the meandering form, from a side close to the mirror unit toward a direction of the piezoelectric actuator unit (14, 16), and thereby, each of the plate-shaped members is identified, the mirror driving device (10, 110, 210) comprises, as the stress detecting unit (24-i), a first stress detecting unit (24-2, 24-3, 125-2, 125-3, 225-2, 225-3) configured to detect a stress to be generated in an odd-numbered plate-shaped member (19-2, 19-3, 219-2, 219-3), and a second stress detecting unit (24-1, 24-4, 125-1, 125-4, 225-1, 225-4) configured to detect a stress to be generated in an even-numbered plate-shaped member (19-1, 19-4, 219-1, 219-4).