A rigid endoscope set according to the present invention includes a first insertion portion that is inserted into a subject, a first channel provided in the first insertion portion, and a first observation portion that is disposed at the tip of the first insertion portion and observes the subject. A rigid endoscope main body, a second insertion part inserted into and removed from the first channel, a treatment instrument guide having a second channel provided in the second insertion part, a needle part insertable into and removed from the second channel, and a treatment A third insertion section that can be inserted into and removed from the first channel in place of the instrument guide, and an optical tube having a second observation section provided at the tip of the third insertion section for observing the subject. 本発明による硬性鏡セットは、被検体に挿入される第１挿入部、第１挿入部に設けられた第１チャンネル、および第１挿入部の先端に配置され被検体を観察する第１観察部を有する硬性鏡本体と、第１チャンネルに挿抜される第２挿入部、および第２挿入部に設けられた第２チャンネルを有する処置具ガイドと、第２チャンネルに挿抜可能な針部と、処置具ガイドに代えて第１チャンネルに挿抜可能な第３挿入部、および第３挿入部の先端に設けられ被検体を観察するための第２観察部を有する光学視管とを含む。
