To provide a side chest for desk in which the position of a top plate is not deviated from the outside of a main body of chest in the state of moving up the top plate to the almost same face as the top plate of a desk as a lifting means of the top plate of the side chest.

This side chest for desk is provided with the main body of chest, top plate 1 arranged at the head part of the main body of chest, and lifting means for freely lifting the top plate 1 to the top of the main body of chest. Then, the lifting means is composed of fixed legs 2 held inside the almost centers of left and right side plates 81 and 81 in the longitudinal direction of the main body of chest, lifting legs 3 inserted into the fixed legs 2 so as to be freely lifted for connecting the top plate 1 to their upper ends, operating levers 4 held inside the lifting legs 3 so as to be freely moved up and down, lock bodies 5 turned while interlocked with the vertical movement of the operating levers 4 so as to be freely engaged/disengaged to plural lock holes 21 formed in the vertical direction of operating levers 4, and manipulating poles for vertically moving the operating levers 4, and the lock bodies 5 are always energized in lock direction.