A push nut comprises legs (6, 7), each of which is configured with outer struts (5), inner struts (17) spacedly disposed between the outer struts (5), and a tongue (19) lying between the inner struts (17) and projecting into an inner space (16) and intended to bear against a shank of a bolt that can be screwed into a thread portion (4). A high pull-out strength is thereby obtained with relatively low material expenditure.