To eliminate hardness of use and finding a storing place, by equipping a tube to which an interdental brush can be mounted on the shaft side of the tooth brush and detachably mounting the interdental brush thereon.

A tooth brush shaft 4 and a brush 6 are mounted on a right and left cover receiving main shaft 6. A tube receiver 1 and a tube 2 are mounted on the right and left cover receiving main shaft 6. The interdental brush 3 is mounted on the tube 2. When the brush is to be used, a brush side groove is pressed and a tooth brush cover 9 is put off, and an interdental brush side groove is pressed to extract the interdental brush cover 10 to exchange the interdental brush for using as an interdental brush. By using this brush, the tooth brush and the interdental brush can be used for respective use and the interdental brush can be exchanged, this is used as a tooth brush.