A weather strip for a vehicle door for being fitted to an upper edge flange of a door inner panel forming a window opening edge of the vehicle door having a lifting/lowering window pane. The weather strip includes: a main body portion having an insertion groove to be fitted to the upper edge flange; a seal lip portion projecting from the main body portion to be in resilient contact with the lifting/lowering window pane; and a resilient retainer to be resiliently engaged with a door trim. The main body portion includes a fixing portion to be engaged with the upper edge flange. The resilient retainer is projected outward from the main body portion in a substantially horizontal direction and perpendicular to an attaching portion provided at an upper portion of the door trim, when the insertion groove is fitted to the upper edge flange substantially.