An improved brush holding structure of interdental brush comprises a brush holding part, a brush fixing member and a gripping part. The brush holding part is a rod body with a perforation at one end. The axes of the perforation and the brush holding part are perpendicular to each other and a recess is provided at least on one side of the perforation. The recess is disposed to be parallel to the axis of the brush holding part and the tail end of the brush holding part is in a flat and closed shape while the other end is formed with a bending neck part. The brush fixing member has at least one locking element sleeved onto the brush holding part. The gripping part is a long rod body extended from the bending neck part of the rod body for the user to grip.一種齒間刷之持刷構造改良結構,具有持刷部,為桿狀體,其一端具有穿孔,穿孔與持刷部之軸心呈相互垂直,且穿孔上至少一側設有凹槽,而凹槽的設置與持刷部之軸心平行,且持刷部之尾端為平整封閉狀,而另一端形成折彎頸部;固刷件,具有至少一個的鎖固元件並套設於持刷部;以及,握持部,為自桿狀體之折彎頸部延設的長桿體,可供使用者握持。20‧‧‧持刷部201‧‧‧穿孔202‧‧‧凹槽203‧‧‧尾端204‧‧‧折彎頸部21‧‧‧固刷件211‧‧‧鎖固元件212‧‧‧螺纹部22‧‧‧握持部30‧‧‧齒間刷頭31‧‧‧固定部32‧‧‧阻擋元件33‧‧‧毛刷部331‧‧‧毛刷
