PURPOSE: To obtain a photographic emulsion contg. grains which intensity the photographic sensitivity of the photographio emulsion and have {100} crystal faces having the improved photographic sensitivity by specifying the constitution of site directors, etc.

CONSTITUTION: The site directors are adsorbed on the {100} crystal faces, and 0.5 to 50mol% of the total quantity of the silver, forming the face-centered cubic crystal structure of the grains, exists in the intersected parts of the {100} crystal faces to form projections. The silver halide, forming these projections, exhibits solubility at least equal to the solubility of the silver halide, forming the {100} crystal faces. Further, the structures of the site directors satisfy the formula. In the formula, R2 is hydrogen or an arbitrarily substd. hydrocarbon; R5 is an electron withdrawing substituent; R6 is hydrogen, alkyl or an electron withdrawing group; Q is a quaternary substituent; X is a charge balance paired ion; n is 0 or 1.