A stopper head (1) to be secured to a stopper body (2) to form a stopper for a container, includes a base (3) on which a lug (4) is positioned such that it protrudes, the lug (4) being designed to cooperate with the body during the assembly of the body and the lug (4), the lug (4) including at least one recess (5) opening laterally, at both of its ends, such that the lug (4) is crossed through to anchor the body with the head (1).