Cutting unit and shaving head of a shaving device

A rotary cutting unit of a shaving head of a shaving device, which cutting unit includes an external cutting member and an internal cutting member. In an interconnected condition, a holding force prevents the external and internal cutting members from moving apart. The holding force is at least exerted by a first central portion of the external cutting member upon a second central portion of the internal cutting member, and/or vice versa. The holding force may for example be provided by a snap connection or magnetic attraction between the first and second central portions.