A medical treatment tool includes a bendable tube configured to be inserted into a body of a patient and an operating body disposed in the insertion tube and configured to cause bending of the bendable tube, the operating body including: a plurality of divided members that are divided from each other along axially extending edges of the divided member, portions of the divided member forming a tubular structure, and an annular connecting portion that connects distal portions of the divided members. Each divided member includes at least one cutout portion formed between the tubular structure and the annular connecting portion.
