Abstract: A door security device, the device comprising in combination:a bracket (3) defining a stop wall, the bracket (3) having a pivotal mount (18,20) to mount, in use, to an inner face of a door (10); andan elongate prop (1) having a first end (2) and a second end, (4) the first end (2) of the prop (1) having a pivotal mount (6, 8) to mount, in use, to a surface (13) such as a wall adjacent the door (10) and the second end (4) of the prop (1) being adapted to co-operatively engage with the stop wall (16,17) of the bracket (3) to brace the door (10) against the adjacent surface (13) when the bracket (3) is in a first radial orientation but to disengage the stop wall of the bracket (3) when the bracket (3) is turned about the bracket's pivotal mount (18,20), the bracket (3) being turnable about the mount (18, 20) by use of a key means (21) which is co-operatively engageable with the pivotal mount (18,20) of the bracket (3) from the outer face of the door (10).