A headlight device, comprising first and second irradiation systems (13a, 13b), and a control unit configured to control the first and second irradiation systems (13a, 13b), the irradiation systems (13a, 13b) individually including a light source (14a, 14b) and a light deflector (15a, 15b) configured to deflect light from the light source (14a, 14b), and including a projector unit (19a-d) common to the irradiation systems (13a, 13b) to project light from the light deflectors (15a, 15b) to an irradiation region (SPOT, MID, WIDE) in front, wherein the light deflector (15a, 15b) of each irradiation system (13a, 13b) includes: a mirror unit configured to reflect light from the light source (14a, 14b) in a direction corresponding to a turning angle of the mirror unit about a first rotation axis and a second rotation axis, the first rotation axis and the second rotation axis being orthogonal to each other; a first actuator configured to reciprocally turn the mirror unit about the first rotation axis in accordance with a first driving voltage; and a second actuator configured to reciprocally turn the mirror unit about the second rotation axis in accordance with a second driving voltage, wherein the control unit includes, for the light deflectors (15,a, 15b) of the irradiation systems (13a, 13b): a resonant control unit configured to generate the first driving voltage based on sinusoidal voltage at a first frequency that is a resonant frequency of natural oscillation of the mirror unit about the first rotation axis, and to output the first driving voltage to the first actuator; and a non-resonant control unit configured to generate the second driving voltage based on basic driving voltage having an increasing and decreasing waveform at a second frequency, the second frequency being a non-resonant frequency lower than the first frequency, and to output the second driving voltage to the second actuator, wherein, in the first irradiation system, directions of the first and second rotation axes of the light deflector relative to an optical axis of incident light to the mirror unit are set so that reflected light from the mirror unit due to reciprocal turning of the mirror unit about the first rotation axis is scanned horizontally in an irradiation region (MID, WIDE) in front and reflected light from the mirror unit due to reciprocal turning of the mirror unit about the second rotation axis is scanned vertically in the irradiation region (MID, WIDE) in front, characterized in that in the second irradiation system, directions of the first and second rotation axes of the light deflector relative to an optical axis of incident light to the mirror unit are set so that reflected light from the mirror unit due to reciprocal turning of the mirror unit about the first rotation axis is scanned vertically in an irradiation region (SPOT) in front and reflected light from the mirror unit due to reciprocal turning of the mirror unit about the second rotation axis is scanned horizontally in the irradiation region (SPOT) in front, wherein the non-resonant control unit generates, for the second actuator of the second irradiation system, the second driving voltage based on superimposed voltage obtained by superimposing offset voltage with the basic driving voltage, wherein the irradiation region (SPOT, MID, WIDE) includes a first irradiation region and a second irradiation region, the first irradiation region being irradiated with light from the first irradiation system, and the second irradiation region being irradiated with light from the second irradiation system, and wherein the non-resonant control unit generates the second driving voltage so that the second irradiation region is displaced horizontally within the first irradiation region. a mirror unit configured to reflect light from the light source (14a, 14b) in a direction corresponding to a turning angle of the mirror unit about a first rotation axis and a second rotation axis, the first rotation axis and the second rotation axis being orthogonal to each other; a first actuator configured to reciprocally turn the mirror unit about the first rotation axis in accordance with a first driving voltage; and a second actuator configured to reciprocally turn the mirror unit about the second rotation axis in accordance with a second driving voltage, a resonant control unit configured to generate the first driving voltage based on sinusoidal voltage at a first frequency that is a resonant frequency of natural oscillation of the mirror unit about the first rotation axis, and to output the first driving voltage to the first actuator; and a non-resonant control unit configured to generate the second driving voltage based on basic driving voltage having an increasing and decreasing waveform at a second frequency, the second frequency being a non-resonant frequency lower than the first frequency, and to output the second driving voltage to the second actuator,