A computer housing includes: a housing body; a first supporting plate mounted in the housing body; a second supporting plate mounted in the housing body and cooperating with the first supporting plate to define a mounting space therebetween; and an operating lever pivoted to the second supporting plate, formed with an engaging tongue, and rotatable relative to the second supporting plate between a first angular position, in which the engaging tongue extends into the mounting space for retaining a box-like device in the mounting space, and a second angular position, in which the engaging tongue is disposed outside of the mounting space for permitting removal of the box-like device.