There is provided a stowable vehicle seat having an erroneous operation preventive mechanism operating at the time of stowage/restoring operation. A stowable vehicle seat having an operating element using a strap for stowage/restoring operation includes brackets formed on a seat back frame, a rocking member rockably supported on the brackets, and a braking member fixed to the strap. The brackets each have an elongated hole extending in the up/down direction. The rocking member includes right and left plate bodies, each having a braking hole that is long in the up/down direction, and an upper plate connecting the plate bodies to each other. The upper plate comes into sliding contact with the strap on its lower side. The braking holes each have an expanded-width part on their front side. The braking member has the erroneous operation preventive mechanism formed being inserted through both of the elongated holes and the braking holes.