To provide a concentrated blix solution composition for a silver halide color photosensitive material which reduces container contamination at long-term storage.

The concentrated blix solution composition for a silver halide color photographic sensitive material consists of a concentrated composition part, containing a bleaching agent and a concentrated composition part containing containing a fixing agent. The concentrated composition part, containing the bleaching agent, has pH 2.0-3.6 and contains a ferric complex salt of an aminopolycarboxylic acid and a nitrate, wherein the molar ratio between iron ions of the ferric complex salt and nitric acid ions of the nitrate is 1:2 to 1:6. The concentrated composition part, containing the bleaching agent, is housed in a container so that the container has a free volume of 3-30%, after housing.