A cowl top cover of the present invention provides that hardly applies influence when a dimension error occurs to a component, on sealability between the cowl top cover and a bonnet hood, a performance of a washer nozzle. The cowl top cover of the present invention includes at least one bent part that is formed to be bent in a mountain-like and a valley-like shape in a vehicle height direction as viewed in a cross section orthogonal to a vehicle widthwise direction, and the bent part includes a flexural deformation structure with which it is possible to allow a locally flexural deformation in a vehicle lengthwise direction in the bent part and to enable expansion and contraction of a distance in the vehicle lengthwise direction between a locking pawl part disposed at first end of the cowl top cover and a seal member fixation part disposed at second end of the cowl top cover.