In a binocular loupe production method capable of attaching a loupe to a carrier lens at a correct downward attachment angle by measuring a forward tilting angle of a worker accurately, a square marker is attached to a frame having the carrier lens, and the face of a user wearing the frame and looking at a working operation point P located below while assuming a working posture taken when he or she uses the binocular loupe is photographed from the working operation point P. A forward tilting angle α of the carrier lens is calculated on the basis of the degree of change from the square shape to a trapezoidal shape of the marker in an oblique image of the face photographed from below, and a downward attachment angle r at which a loupe is attached to the carrier lens is determined according to the forward tilting angle α.