1. A silver complex diffusion transfer processing solution composition containing substantially no developing agent which comprises: (1) an alkaline substance, (2) an alkali metal sulfite, (3) a solvent for silver halides which is other than sulfite, (4) 1.7.times.10.sup.-3 to 1.7.times.10.sup.-2 mole/liter of a bromide, (5) a content of potassium ion of 2.0 to 12.0 mol % based on the total cations of the salts contained in the composition, and (6) water.