A rear pillar device for a vehicle may include: a rear pillar (10) which supports a rear quarter of the vehicle; and a reinforcing member (20) mounted to the rear pillar (10), the rear pillar (10) comprising: a support (12) vertically supporting the rear quarter; an over-door section (14) configured between a door and a roof for supporting the roof; a rear end (16) extending from the support (12) and connected to a rear side of a vehicle body; and a glass seat (18) formed between the over-door portion (14) and the rear end (16) and configured to mount a rear glass panel, and wherein the reinforcing member (20) comprises: an upper reinforcing member (22) which is integrally mounted on the over-door portion (14), the glass seat (18) and the rear end (16) in a longitudinal direction of the vehicle body; and a vertical reinforcement member (24) mounted on the support (12) and connected to the upper reinforcement member (22).
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