A manipulation unit includes a body, a tool holder, and a manipulated portion. The body has a first end, a second end opposite to the first end, and a peripheral surface connecting the first end and the second end. The first end is attachable to a robot arm. The tool holder is connected to the second end and configured to hold a tool. The manipulated portion is provided on the peripheral surface. The manipulated portion includes a manipulation surface and a surrounding portion. The robot arm is to be operated via the manipulation surface. The surrounding portion surrounds the manipulation surface such that the manipulation surface is recessed from the surrounding portion.