A fitting for a corner cupboard comprises a support arm mounted to a basis such that it can be pivoted in a pivoting movement about a first vertical pivot axis; an elongated tray supported on the support arm such that it can be pulled out in a pull-out movement along a horizontal axis. A coupling device coupling the pivoting movement of the support arm to the pull-out movement of the tray comprises a control arm which, at its one end, is mounted to the basis such that it can be pivoted about a second vertical pivot axis and which, at its other end, is mounted to the tray such that it can be pivoted about a third vertical pivot axis. In a pushed-in position of the tray the second pivot axis, when viewing along the horizontal axis, is arranged between the first and third pivot axes.