An attachment structure (12) of a lighting device (10) has: a holder (80) provided on a top surface (24) of a door pocket (18) that constitutes a door lining (14), the lighting device (10) being placed in the holder (80); walls (90, 102) for fixing the lighting device (10) placed in the holder (80); a light source supporting part (92); and a connector supporting part (100). In this case, the attachment structure (12) and the top surface (24) of the door pocket (18) are configured integrally.