PROBLEM TO BE SOLVED: To provide an interdental brush that enhances interdental cleaning force and user's actual sensation of cleaning.SOLUTION: The interdental brush includes: a handle part 2 and a cleaning part 3 that is provided at the tip end of the handle part 2. The cleaning part 3 comprises: a synthetic resin-made shaft material 4 extending from the tip end of the handle part 2； and a plurality of projection pieces 5 that radially project from the shaft material 4 in the view from the extending direction of the shaft material 4. The plurality of projection pieces 5 have more than one first projection piece 5a made of first synthetic resin and more than one second projection piece 5b made of second synthetic resin that is harder than the first synthetic resin.SELECTED DRAWING: Figure 1【課題】歯間の刷掃力及び使用者の清掃実感を向上させえた歯間ブラシの提供。【解決手段】把持部２と、前記把持部２の先端に設けられた清掃部３とを備え、前記清掃部３は、前記把持部２の先端から延びる合成樹脂製の軸材４と、前記軸材４の延在方向から見て、前記軸材４から放射状に突出する複数の突出片５とを備え、前記複数の突出片５は、第一の合成樹脂からなる１つ以上の第一の突出片５ａと、前記第一の合成樹脂より硬い第二の合成樹脂からなる１つ以上の第二の突出片５ｂとを備える、歯間ブラシ。【選択図】図１
