An optical scanning projector apparatus includes a light emitting element array having a plurality of light emitting elements arranged in a row in a first direction for emitting light according to display data; a light scanning unit for scanning light of the light emitting elements in a second direction perpendicular to the first direction; a scanning optical system for collecting light of the light emitting elements to form an image on a screen; and a control unit for controlling the light scanning unit and the scanning optical system. The light emitting elements include micro resonator type light emitting diodes (LED) having a radiation angle smaller than or equal to 20 degrees at a half of maximum light intensity.