An openable side window for a motor vehicle is provided having an openable side window which covers a lateral vehicle opening when in its closed position and can be locked by a securing device, the securing device comprising a pivotable securing handle which can be pivoted between an unlocked position and a locked position and has an operating arm and a latch arm which, when in the locked position, interacts with a latch counterpart, wherein the latch arm comprises a functional element which is pre-loaded radially outward with respect to a pivot axis of the securing handle.