To provide vehicular pillar structure capable attaching a door seal to a pillar via a clip, and capable of securing the rigidity of a stiffener.

This vehicular pillar structure 15 includes the center pillar 22 of closed cross section structure sandwiched with the stiffener 34 between an outer panel 31 in a cabin outside side 39 and an inner panel in a cabin 32 side, the door seal 29 is attached to the outer panel 31 by the clip 26, and a distal end part 26a of the clip is projected toward the stiffener. The vehicular pillar structure 15 is provided with a groove part 57 for avoiding an interference with the distal end part of the clip, and the groove part 57 is extended along a longitudinal direction of the stiffener, and is formed bead-likely.