To reduce a using amount of processing liquid used for making the recording marks of an ink ribbon unable to read.

A sponge roller 61 impregnated with the processing liquid and coating the processing liquid onto the ink ribbon is divided into two areas of an outer diameter part A and an inner diameter part B. The outer diameter part A is arranged outside the inner diameter part B, and the porosity of the outer diameter part A is smaller than that of the inner diameter part B. Further the diameter of a pore in the outer diameter part A is smaller than that of the inner diameter part B. Furthermore, a storing tank of the processing liquid is arranged inside the sponge roller and the processing liquid is fed to the sponge roller from the storing tank.