A support assembly which supports a computer device body having a display unit. The support assembly includes a base member which is supported on an installation plane, a shaft which extends in parallel to a plane of the base member, a first support member having one end portion joined to the base member and the other end portion which supports the shaft, at least one pinion gear which is concentrically joined to the shaft, a second support member including a first support part which supports the computer device body having the display unit, a second support part which extends from the first support part to have a predetermined curvature, and a rack gear which is formed on a plane of the second support part facing the shaft along the extension direction of the second support part and moves according to rotation of the computer device body supported by the first support part.