An object of the present invention is to provide an interdental brush which is capable of suppressing injury to the gingiva during use in an interdental brush having an L shape and suppressing bending of the rear end (base) of the brush portion It aims. A first projecting portion (41) provided at the tip of the handle body and projecting in the same direction E as the extending direction of the distal end portion (16A) of the handle body, a first projecting portion (41) projecting in the G direction crossing the first projecting portion A second protruding portion (42) protruding and contracting in diameter in a direction from the rear end to the tip end, and a second protruding portion (42) integrally formed with the front end of the first protruding portion (41) and the rear end of the second protruding portion A core portion (12) including a connection portion (43) formed in a curved shape and made of a hard resin, a sheath portion (45) covering at least the second projection portion (42) And a brush part (13) including a plurality of brush bodies (46) provided on the outer periphery of the sheath part (45) and made of a soft resin softer than the hard resin.本発明は、L字形状とされた歯間ブラシにおいて、使用時に歯肉を傷つけることを抑制可能で、かつブラシ部の後端(基部)が折れ曲がることを抑制可能な歯間ブラシを提供することを目的とする。ハンドル体の先端に設けられ、ハンドル体の先端部(16A)の延在方向と同じE方向に突出する第1の突出部(41)、第1の突出部(41)と交差するG方向に突出し、後端から先端に向かう方向に対して縮径された第2の突出部(42)、及び第1の突出部(41)の先端と第2の突出部(42)の後端と一体に構成され、湾曲した形状とされた接続部(43)を含み、かつ硬質樹脂で構成された芯部(12)と、少なくとも第2の突出部(42)を覆う鞘部(45)、及び鞘部(45)の外周に設けられた複数のブラシ体(46)を含み、かつ硬質樹脂よりも軟質な軟質樹脂で構成されたブラシ部(13)と、を有する。
