Abstract: The present invention relates to a device for carrying out a paint touch up in a corner formed by the intersection of two planar sufaces disposed at right angle with respect to each other. Such a touch up device comprises a first part including a handle and provided with a rectangular plate for masking from the corner a portion of a first of the two surfaces. The touch up device also comprises a paint roller provided with a handle constituted by a rod and holding this roller at one end. The rod is bent in order to cooperate with a guiding system of the first part for the purpose of, when this first part masks the above-mentioned portion of the first surface, positioning the paint roller and guiding any movement along the corner transmitted to this roller through its handle so as to allow painting from the corner of a portion of the second of the two surfaces, which portion of the second surface corresponds to the portion of the first surface masked by the first part.