PURPOSE: To make it possible to surely perform cleaning without disfiguring a surface to be cleaned on any different condition of the cleaning by arranging the outer ends of respective brush hairs in a cylindrical shape and making the brush hairs in the center of the tip of a brush base shorter and thinner than the other.

CONSTITUTION: A brush body 7 is formed by planting brush hairs 9 on a semi- spherical brush base 8 while arranging the outer ends thereof in a cylindrical shape. The brush hairs 9a in the center of the front part of the brush base 8 is made to be shorter and thinner than the other. With this arrangement, when the cleaning is performed in the front surface of the brush body 7, the operational force is transmitted to the surface to be cleaned mainly through the center of the front surface of the brush hairs 9. Since the brush hairs 9a is made to be shorter and thinner, it is possible to surely perform the cleaning without disfiguring the surface to be cleaned.