present invention prevents breakage of the optical fiber that occurs in the adhesion portion for fixing the array member and the optical fiber, furthermore an object to configure shorten the rigid portion of losing the flexibility of the distal portion of the probe, the array member an adhesive portion 18 provided on the side of one end 16b in which a plurality of optical fibers 12, 13 of 16 extends, in contact with the other end 16c of the cylindrical portion 15a and array member array member holds the outer periphery of the inserted array member It comprises a tubular member 15 having an end portion 15 b, and a locking member 17 in contact with one end 16b of the array member. Array member by a terminating portion and the locking member is sandwiched in the axial direction, the cylindrical portion in a state in which the axial position is determined and the locking member are fixed to each other with respect to the cylindrical portion of the array member, array member and the adhesive parts are housed inside the structure consisting of the tubular member and the locking member. Adhesive is held in the holding hole 17c provided in the locking member in close contact with the plurality of optical fibers with each other so as not to flow toward away from the array member.本発明は、アレイ部材と光ファイバーとを固着する接着部において発生する光ファイバーの破損を防ぐ、さらにはプローブの先端部の柔軟性を失う硬性部を短く構成することを課題とし、アレイ部材16の複数の光ファイバー12,13が延出する一端16bの側に設けられた接着部18と、アレイ部材が挿入されアレイ部材の外周を保持する筒部15a及びアレイ部材の他端16cに接触した終端部15bを有した筒状部材15と、アレイ部材の一端16bに接触した係止部材17とを備える。終端部と係止部材とによりアレイ部材が軸方向に挟まれて、アレイ部材の筒部に対する軸方向の位置が決定された状態で筒部と係止部材とが互いに固定され、アレイ部材及び接着部が筒状部材及び係止部材からなる構造の内部に収められている。接着剤がアレイ部材から離れる方へ流動しないように複数の光ファイバー同士が密着して係止部材に設けられた保持孔17cに保持されている。
