To enhance high sensitivity in the red wavelength region and to reduce residual dye stains after development by using a specified photographic spectral sensitizing dye.

This spectral sensitizing dye to be used for a photographic sensitive material is represented by the formula in which each of Z1-Z5 is an atomic group necessary to form a 5- or 6-membered N-containing hetero ring and the N-containing hetero ring to be formed by Z1 is embodied by an oxazoline and oxazole ring and the like and each of that by Z2 and Z3 and that by Z4 and Z5 is an oxazolidine and thiazolidine rings and the like; R1 is an optionally substituted alkyl or aryl group, preferably, ≤6C optionally substituted alkyl groups; and R2 is an optionally substituted alkyl group, preferably, ≤6C alkyl groups.