An image forming apparatus comprising: a light emitting device that emits light; a movable mirror that reflects the light emitted from the light emitting device ; a first actuator that causes the movable mirror to swing about a first axis (ai); a second actuator that causes the movable mirror to swing about a second axis (a 2 ); a first reference signal output portion that outputs a first reference signal by estimating a point in time when a deflection angle of the movable mirror about the first axis (a 1 ) becomes equal to a first reference angle, wherein the first reference signal output portion estimates the point in time when the deflection angle of the movable mirror about the first axis (a 1 ) becomes equal to the first reference angle, based on a first driving signal provided to the first actuator ; a second reference signal output portion that outputs a second reference signal by estimating a point in time when a deflection angle of the movable mirror about the second axis (a 2 ) becomes equal to a second reference angle, the second reference signal output portion estimates the point in time when the deflection angle of the movable mirror about the second axis (a 2 ) becomes equal to the second reference angle, based on a second driving signal provided to the second actuator ; a light emission controller that causes the light emitting device to emit the light based on the first reference signal output from the first reference signal output portion ; an imaging apparatus that images the light reflected by the movable mirror ; and a correction portion that corrects a timing of the first reference signal output by the first reference signal output portion and a timing of the second reference signal output by the second reference signal output portion based on imaging information acquired by the imaging apparatus . a light emitting device that emits light; a movable mirror that reflects the light emitted from the light emitting device ; a first actuator that causes the movable mirror to swing about a first axis (ai); a second actuator that causes the movable mirror to swing about a second axis (a 2 ); a first reference signal output portion that outputs a first reference signal by estimating a point in time when a deflection angle of the movable mirror about the first axis (a 1 ) becomes equal to a first reference angle, wherein the first reference signal output portion estimates the point in time when the deflection angle of the movable mirror about the first axis (a 1 ) becomes equal to the first reference angle, based on a first driving signal provided to the first actuator ; a second reference signal output portion that outputs a second reference signal by estimating a point in time when a deflection angle of the movable mirror about the second axis (a 2 ) becomes equal to a second reference angle, the second reference signal output portion estimates the point in time when the deflection angle of the movable mirror about the second axis (a 2 ) becomes equal to the second reference angle, based on a second driving signal provided to the second actuator ; a light emission controller that causes the light emitting device to emit the light based on the first reference signal output from the first reference signal output portion ; an imaging apparatus that images the light reflected by the movable mirror ; and a correction portion that corrects a timing of the first reference signal output by the first reference signal output portion and a timing of the second reference signal output by the second reference signal output portion based on imaging information acquired by the imaging apparatus . <EOS>