A hinge assembly includes a pivot shaft, a first supporting member, a second supporting member, and a positioning member. The first supporting member is rotatably sleeved on the pivot shaft. A positioning protrusion is formed on the first supporting member. The second supporting member is non-rotatably sleeved on the pivot shaft. The positioning member has an elastic portion and is non-rotatably sleeved on the pivot shaft. A positioning groove receiving the positioning protrusion is defined in a periphery of the positioning member and adjacent to the elastic portion. An LCD device is further provided in the present disclose.