There is disclosed an automatic eye refractive power measuring apparatus for automatically measuring refractive power of an eye under test by means of objective measurement. It comprises a projection system for projecting a measuring target image to a retina of the eye under test by invisible light; an imaging optical system for imaging a reflection image of the measuring target image projected to the retina and reflected by the retina; an opto-electric detector having a photosensitive surface disposed at imaging position and adapted to output electrical signal corresponding to the measuring target image formed on the photosensitive surface; display device for displaying the measuring target image reflected on the retina based on the electrical signal as a visible image; and an auto-measuring portion adapted to detect focussing state of the measuring target image projected to the retina based on the electrical signal and automatically calculated refractive power of the eye under test from the electrical signal.