Glass run

A glass run includes: a bottom wall; a vehicle-outer-side side wall; and a vehicle-inner-side side wall. The bottom wall, the vehicle-outer-side side wall and the vehicle-inner-side side wall configure a basic framework being attached to a door frame groove portion formed in a door frame. The glass run guides an up and down movement of a door glass. A thick portion that protrudes to a vehicle inner side, is in sliding contact with the door glass, and has a higher hardness than that of the vehicle-outer-side side wall is formed on a vehicle inner side of the vehicle-outer-side side wall. When a thickness of the thick portion is set to t1 and a sum of thicknesses of the thick portion and the vehicle-outer-side side wall is set to T, t1 is 0.4T or more and 1.0T or less.