PURPOSE: To soften or dissolve urolith while sitting on a toilet stool by interposing microorganisms which produce components which soften or dissolve urolith between a large number of small sections between each of stacked water permeable sheets.

CONSTITUTION: Two water permeable sheets 2 are placed one upon another, thereby joining the water permeable sheets 2 linearly. Then, a large number of small segments 5 are produced by joining each of the water permeable sheets 2. Microorganisms, which produce components which soften or dissolve urolith, are interposed in each of the small segments 5, thereby constituting a urolith processing pad 1. The urolith processing pad 1 is put on a urolith attached-part 6a of a urinal 6 so as to cover the surface all over. Then, the microorganisms in the urolith processing pad 1 try to soften the organic components in the urolith or dissolve or soften an attached interface with the urinal 6 of the uroliths or the like, thereby making the urolith separable from the urinal with ease.