A platinum microparticles generator comprises a linear first electrode, a board-shaped second electrode, and an applying means. The first electrode contains at least platinum. The second electrode comprises an outlet opening, which is a circular through-hole, located so as to face one end of the first electrode. The applying means applies a voltage between the first and second electrodes. Then, the first electrode has an outside diameter in a range of 0.03 [mm] to 0.10 [mm]. Further, the outlet opening has an inside diameter in a range of 1.0 [mm] to 4.5 [mm]. Thus, the platinum microparticles generator can emit a sufficient amount of platinum microparticles while restraining generation of ozone.