A medical tube 30 has a tubular main body 31 curved in a circular arc shape. The main body 31 has a flat shape as a cross-sectional shape at a central portion S4 in the longitudinal direction thereof. The main body 31 has a flat shape including a minor axis and a major axis as a cross-sectional shape at the central portion in the longitudinal direction thereof. The angle formed between the minor axis J31 and a plane containing both a center point of the circular arc in the central portion S4 and a center point of the cross-sectional shape with respect to the longitudinal direction of the main body is an acute angle. The angle is preferably 20° to 60°. The medical tube 30 thus configured is for use in treatment of a disorder in a pelvic organ, by indwelling an implant between a urethral lumen and a vaginal cavity.
