A vehicle pedal device includes a main bracket with a pair of side plates supporting a pedal and attached to a dash panel, and a sub-bracket coupling a main bracket rear end and reinforcement. Where both ends of a clinching pin inserted through coupling holes formed in side plate rear ends are inserted through insertion holes of sub-bracket side plate portions, the both ends are axially clinchingly compressed, whereby the rear ends are clinchingly attached to the portions to be overlapped, inner peripheral edges of the coupling and insertion holes having a non-circular shape, distances from their centers circumferentially varying, the portions being extended outward to be separated further away from the side plates toward the panel, and the insertion holes formed in the portions having an elongated hole shape whose length allows the both ends protruding from the side plates to pass therethrough where the portions are extended outward.