Lockable caster wheel for rollable furniture and devices, comprising a wheel or double wheel which is mounted on a horizontal transverse axis of a bearing body so as to be pivotable about a vertical axis, and comprising a fastening flange having a pivot bearing, and a locking device which can be lowered onto the wheel, the locking device being arranged movably between the fastening flange and the wheel and having upper and lower functional surfaces (17, 18) that have said flange and said wheel, a lower functional surface between the locking device and the wheel forming a horizontal braking surface in each angular position of the wheel, and an upper functional surface between the locking device and the fastening flange and/or the flange surface thereof that faces the locking device having at least one inclined plane (19, 20) which projects toward the opposite surface and which starts at the transition of the horizontal surface of the locking device and/or of the fastening flange to the at least one inclined plane (19, 20), and the respectively opposite surface either a protruding latching surface or an oppositely projecting inclined plane starting from the surface, and the locking device being moved from an unbraked position in front of or at the start, close to the surface, of an inclined plane (19, 20) in contact with the mutual latching surface or inclined plane, into a braked position of the caster wheel, in which the latching surface runs onto the inclined plane (19, 20) or in which the inclined plane (19, 20) is run onto in the opposite direction, and in which the braking surface of the locking device is held pressed against the surface of the wheel, characterized in that the fastening flange is designed as a wheel cup in the manner of a cup and can be retractably installed in a recess of an underbody of an item of furniture or of a device, the wheel cup having an opening which is horizontal to one side of an item of furniture and into which the locking lever extends, which lever extends behind the contour of the wheel cup and of the furniture at least in both end positions. the locking device being arranged movably between the fastening flange and the wheel and having upper and lower functional surfaces (17, 18) that have said flange and said wheel, a lower functional surface between the locking device and the wheel forming a horizontal braking surface in each angular position of the wheel, and an upper functional surface between the locking device and the fastening flange and/or the flange surface thereof that faces the locking device having at least one inclined plane (19, 20) which projects toward the opposite surface and which starts at the transition of the horizontal surface of the locking device and/or of the fastening flange to the at least one inclined plane (19, 20), and the respectively opposite surface either a protruding latching surface or an oppositely projecting inclined plane starting from the surface, and the locking device being moved from an unbraked position in front of or at the start, close to the surface, of an inclined plane (19, 20) in contact with the mutual latching surface or inclined plane, into a braked position of the caster wheel, in which the latching surface runs onto the inclined plane (19, 20) or in which the inclined plane (19, 20) is run onto in the opposite direction, and in which the braking surface of the locking device is held pressed against the surface of the wheel, characterized in that the fastening flange is designed as a wheel cup in the manner of a cup and can be retractably installed in a recess of an underbody of an item of furniture or of a device, the wheel cup having an opening which is horizontal to one side of an item of furniture and into which the locking lever extends, which lever extends behind the contour of the wheel cup and of the furniture at least in both end positions.