A video projection apparatus comprising: an optical deflector having a mirror for reflecting a first light beam to project a first view field and reflecting a second light beam different from said first light beam to project a second view field which is not superposed onto said first view field, an actuator for rocking said mirror with an axis of said mirror and a sensor provided in the vicinity of said actuator; an optical guide unit provided within said second view field and located along a direction shifted from a center line of said second view field; a photodetector coupled to said optical guide unit; and a control unit (14, 15, 16) adapted to apply a first sinusoidal-wave voltage (V xa) to said actuator, said control unit being further adapted to: calculate a resonant frequency (f r) of said first sinusoidal-wave voltage (V xa); detect a first timing point from a sense voltage (V xs) of said sensor; detect a second timing point (t1, t2, t3) from a photo detection voltage (V pd) of said photodetector when said second light beam is incident to said optical guide unit; calculate a time period from said first timing point to said second timing point; calculate a product value between said time period and said resonant frequency (f r); and control an amplitude of said first sinusoidal-wave voltage (V xa) so that said product value is brought close to a predetermined value; said video projection apparatus further comprising: a light source adapted to generate a main light beam; a beam splitter adapted to split said main light beam into said first and second light beams (L1, L2), said first light beam being incident directly to said mirror; and a fixed mirror adapted to reflect said second light beam to said mirror. an optical deflector having a mirror for reflecting a first light beam to project a first view field and reflecting a second light beam different from said first light beam to project a second view field which is not superposed onto said first view field, an actuator for rocking said mirror with an axis of said mirror and a sensor provided in the vicinity of said actuator; an optical guide unit provided within said second view field and located along a direction shifted from a center line of said second view field; a photodetector coupled to said optical guide unit; and a control unit (14, 15, 16) adapted to apply a first sinusoidal-wave voltage (V xa) to said actuator, said control unit being further adapted to: calculate a resonant frequency (f r) of said first sinusoidal-wave voltage (V xa); detect a first timing point from a sense voltage (V xs) of said sensor; detect a second timing point (t1, t2, t3) from a photo detection voltage (V pd) of said photodetector when said second light beam is incident to said optical guide unit; calculate a time period from said first timing point to said second timing point; calculate a product value between said time period and said resonant frequency (f r); and control an amplitude of said first sinusoidal-wave voltage (V xa) so that said product value is brought close to a predetermined value; calculate a resonant frequency (f r) of said first sinusoidal-wave voltage (V xa); detect a first timing point from a sense voltage (V xs) of said sensor; detect a second timing point (t1, t2, t3) from a photo detection voltage (V pd) of said photodetector when said second light beam is incident to said optical guide unit; calculate a time period from said first timing point to said second timing point; calculate a product value between said time period and said resonant frequency (f r); and control an amplitude of said first sinusoidal-wave voltage (V xa) so that said product value is brought close to a predetermined value; said video projection apparatus further comprising: a light source adapted to generate a main light beam; a beam splitter adapted to split said main light beam into said first and second light beams (L1, L2), said first light beam being incident directly to said mirror; and a fixed mirror adapted to reflect said second light beam to said mirror. a light source adapted to generate a main light beam; a beam splitter adapted to split said main light beam into said first and second light beams (L1, L2), said first light beam being incident directly to said mirror; and a fixed mirror adapted to reflect said second light beam to said mirror.