To provide a treating device and a treating method of a silver halide photographic sensitive material by which even when the amt. of washing water is largely decreased, dirt or dross in a washing tank are not caused.

In the processes to develop, fix, wash or stabilize a silver halide photographic sensitive material by using an automatic developing machine having a developing tank, a fixing tank and washing tanks of 5 to 40 L total volume, the amt. of the fixing liquid brought by the photosensitive material from the fixing tank to the washing tank is specified to 10 to 60 ml per 1 m2, and the replenishing amt. of the fixing liquid is specified to 65 to 325 ml per 1 m2 of the photosensitive material. After the treatment is completed, the inside of the washing tank is washed with water or a stabilizer.