Provided is a manipulator (5) including a distal-end joint group (11) and a proximal-end joint group (12) that are arranged adjacent to each other in a distal-end section (10) of an insertion part in a longitudinal axis direction and that are configured to bend the distal-end section (10). The proximal-end joint group (12) includes a plurality of proximal-end bending joints (12a to 12d) bendable about axes that are lined-up side-by-side to bend the distal-end section (10) through 180° or more. The distal-end joint group (11) includes first distal-end bending joints (11a, 11b) disposed on a distal side of the proximal-end joint group (12) and bendable about axes crossing a plane including the axes of the proximal-end bending joints (12a to 12d) and the longitudinal axis； and a second distal-end bending joint (11c) disposed in the longitudinal axis direction relative to the axes of the first distal-end bending joints (11a, 11b) and bendable about an axis that is lined-up side-by-side with the axes of the proximal-end bending joints (12a to 12d).
