PURPOSE: To obtain a photosensitive material which decreases staining of the nonimage part in particular and has high image density and high sensitivity by incorporating specific thiourea or the deriv. thereof into a heat developing photosensitive material having a silver halide emulsion layer and image receptive layer.

CONSTITUTION: The compd. expressed by the formula I [R1, R2, R3 are H, (substd.) aliphat. group, (substd.) aryl or heterocycle (substd.), R2 and R3, R1 and R3 may form a 5W7-membered carbon ring or heterocycle by connecting with each other], for example, thiourea, the compd. expressed by the formula II or the like is incorporated into the silver halide emulsion layer of the heat developing photosensitive material contg. the support body carrying the silver halide emulsion layer and (or) image receptive layer or the protective layer thereon. The heat developing photosensitive material with which the high-density image is obtainable with high sensitivity and which decrease the staining in the nonimage part is thus obtd.