An interdental brush structure comprising: a brush head, a handle and at least one outer casing； the brush head has a rod member, a first end of the rod member is combined with a plurality of bristles along a length thereof； the handle is combined with a second end of the rod opposite to the first end； and at least one outer casing disposed on at least one side of the handle, wherein one end of the handle has a longitudinal hole extending into the interior of the handle, and the handle is The side surface is provided with a transverse hole extending transversely through the longitudinal direction, the second end of the rod member penetrates into the vertical hole and enters the transverse hole, and the second end of the rod member is bent and deformed, so that the rod member is fixed to the vertical hole or One of the holes is curved so as to be bent and abutted against the rod to improve the engagement of the handle with the rod.一種牙間刷結構，包括：一刷頭、一刷柄及至少一個外殼；刷頭具有一桿件，桿件的一第一端沿著其軸向一長度上結合複數刷毛；刷柄組合於桿件的相對於第一端的一第二端；以及至少一個外殼，設於刷柄的至少一側，其特徵在於：刷柄的一端具有延伸進入刷柄內部的一縱孔，且刷柄的側面設有橫向貫通縱向的一橫孔，桿件的第二端穿入縱孔並且進入橫孔，桿件的第二端彎曲變形，從而使桿件被固定於縱孔，或透過使縱孔的其中一段呈彎曲狀，藉以抵彎並抵接於桿件，以提高刷柄與桿件的接合效果。
