A portable computer and a shock absorber assembly thereof. The portable computer includes a body, a hard disc drive, a supporting member, an isolator, a frame, and a damper. The hard disc drive is disposed in the body. The supporting member is disposed on the hard disc drive. The isolator is disposed on the supporting member. The frame is disposed on the hard disc drive. The damper is disposed on the frame. Thus, the hard disc drive is connected to the body by the isolator, and connected to the frame by the damper. As a result, the vibration generated by the hard disc drive is isolated to avoid affecting the other portions of the portable computer.