Abstract: Device for fixing a pencil or the like on a security hat of the type comprising a sheath disposed at the base of the hat, constituting a cavity which extends from top to bottom and is open at both ends thereof. The device comprises a generally flat member which is formed of a slight curvature enabling it to rest against the surface of the security hat. A hook is formed from the member enabling to introduce and hold a pencil or an object of the same type. The flat member comprises a tongue intended to be introduced in the cavity by snapping thereby preventing the exit of the tongue once the latter is in position in the cavity.