A supporting apparatus for an electronic device chassis includes a base, a supporting assembly fixed to the base to detachably mount the chassis, a guiding block, an operation member, and a latching member. The guiding block is slidably attached to the supporting assembly along a first direction. The latching member and the operation member are slidably attached to the guiding block along a second direction perpendicular to the first direction. A first protrusion with a first slope and a second protrusion with a second slope protrude from the guiding block. The operation member includes a first sliding block with a third slope abutting against the second slope. The latching member includes a second sliding block with a fourth slope abutting against the first slope. An inserting pin extends up from the guiding block, to engage in the chassis.