A locking assembly including a first locking part on a first object and a second locking part on a second object is provided. The first locking part includes a head portion. The second locking part has an assembling opening and an assembling space behind the assembling opening. An area of a projection of the assembling space on a plane where the assembling opening is located is greater than and lies over the area of the assembling opening. The head portion of the first locking part is adapted to enter the assembling space through the assembling opening along an assembling direction, and then adapted to reach a locking position in the assembling space by moving along an engaging direction parallel to the surface.