A quarter frame side member unit is disclosed. A quarter frame side member unit according to an embodiment of the present invention is a quarter frame side member unit for supporting a predetermined structure of a vehicle body in an upward and downward direction, A lower frame vertically connected to the upper frame through an upper end thereof; A connection frame connecting the lower end of the lower frame and the floor panel; And a reinforcing frame connecting the upper and lower frames; And a spacing space is formed in at least one of the connecting portions of the upper frame, the lower frame, and the connecting frame.
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