The invention relates to a tensioner (1) for an endless drive, in particular of an internal combustion engine, wherein the tensioner has base part (2) and a tensioning part (3) which can rotate relative to the former, a spring element (11) which is arranged between the base part and the tensioning part (3) so as to impart a force, and a friction apparatus (13) which is provided between the spring element (11) and the base part or the tensioning part (3) and by way of which the relative movement between the base part (2) and the tensioning part (3) is damped. In order to improve a tensioner of the generic type in such that a simple construction is possible with satisfactory tensioning, it is proposed to arrange the friction apparatus (13) radially outside the spring element (11).