The cystourethroscope for prostate biopsy of the present invention has an insertion part that can be inserted into a subject and is curved with a predetermined curvature in a state where no external force is applied, and a linear central axis, A gripping portion connected so as to intersect the insertion portion so that the central axis is located in a distal end cross section of the insertion portion, a distal end portion extending in a convex direction of the curve from the distal end cross section, and An observation section formed at the distal end portion, and a treatment instrument insertion channel formed inside the insertion section and opened so that the inserted treatment instrument projects into the observation range of the observation section.本発明の前立腺生検用膀胱尿道鏡は、被検体に挿入可能であり、外力が加えられていない状態で所定の曲率で湾曲している挿入部と、直線状の中心軸を有し、前記挿入部の先端断面内に前記中心軸が位置するように、前記挿入部と交差するように接続された把持部と、前記先端断面から前記湾曲の凸方向に伸張している先端部と、前記先端部に形成された観察部と、前記挿入部の内部に形成され、挿通された処置具が前記観察部の観察範囲内に突出するよう開口している処置具挿通チャンネルと、を含む。
