Provided is an interior side wall structure for a vehicle in which a cylindrical shape of a shock-absorbing member can be crushed and deformed in an axial direction in an orderly manner upon vehicle side collision. When a collision load (F) is input to a shock-absorbing member (10) in the axial direction, a flange portion (13) at a peripheral edge of an open part is uniformly pressed against a door trim (4). At a connecting portion (15) of a peripheral wall (11), stress is distributed by an arc shaped face, whereby the development of crack is avoided, thus enabling even distribution of the load. At the connecting portion (15), buckling rigidity is adjusted by a slit for compression buckling adjustment (16) so as to substantially equalize the buckling rigidity at each portion of the peripheral wall (11), whereby the cylindrical shape of the shock-absorbing member (10) is crushed and deformed in the axial direction in an orderly manner.