PROBLEM TO BE SOLVED: To provide an electric toothbrush superior in tooth cleaning performance and conveniently usable.SOLUTION: The electric toothbrush 1 includes a rotary shaft of a motor M on the rear side of the axis of a grip part case 4. When a cross-section in parallel with the longitudinal axis of a brush bristle part 52 and in parallel with the rotary shaft of the motor M is defined as a side cross-section, an outer face in front of the electric toothbrush 1 in the side cross-section is defined as a front face, an outer face behind the electric toothbrush 1 in the side cross-section is defined as a rear face, one end part to the brush bristle part 52 side in the end parts of the electric toothbrush 1 is defined as a tip end part, the other end part to the body case 2 side in the end parts of the electric toothbrush 1 is defined as a base end part, the length in front of the electric toothbrush 1 from the base end part to the tip end part is defined as length V, and the length behind the electric toothbrush 1 from the base end part to the tip end part in the electric toothbrush 1 is defined as length W, the length W is shorter than the length L.COPYRIGHT: (C)2011,JPO&INPIT【課題】歯の擦掃性能に優れ、磨き勝手のよい電動歯ブラシを提供する。【解決手段】この電動歯ブラシ1は、把持部ケース4の中心軸よりも後側にモータMの回転軸を有する。また、ブラシ毛52の長手軸と平行かつモータMの回転軸と平行な断面を側断面とし、同側断面において電動歯ブラシ1の前側の外面を前面とし、同側断面において電動歯ブラシ1の後側の外面を後面とし、電動歯ブラシ1の端部のうちのブラシ毛52側の端部を先端部とし、電動歯ブラシ1の端部のうちの本体ケース2側の端部を基端部とし、電動歯ブラシ1において基端部から先端部までにわたる電動歯ブラシ1の前面の長さを長さVとし、電動歯ブラシ1において基端部から先端部までにわたる電動歯ブラシ1の後面の長さを長さWとしたとき、長さWが前記長さVよりも小さい。【選択図】図5
