Bollard

A bollard device (1) comprising an outer bollard member (2) which is provided to be anchored into the ground and a longitudinal inner bollard member (3) which is provided to be displaceable according to an upright direction between a retracted position wherein the inner bollard member (3) substantially extends within an interior space (4) of the outer bollard member (2), and an extended position wherein an upper part (5) of the inner bollard member (3) extends above the outer bollard member (2) and forms an obstacle for preventing the passage of a vehicle, wherein in the extended position the upper part (5) substantially extends above the outer bollard member (2) and a lower part (6) of the inner bollard member (3) substantially extends within the interior space (4) of the outer bollard member (2), wherein the lower part (6) of the inner bollard member (3) comprises at least two reinforcement elements (10a, 10b) which are located at a distance from each other with regard to the longitudinal direction of the inner bollard member (3), wherein these reinforcement elements (10a, 10b) form protrusions of the inner bollard member (3) which are directed outwards and form partly the outer surface of said inner bollard member (3).