A window glass supporting structure comprising: a window frame formed in a vehicle body ; a window glass supported on the window frame ; and an adhesive portion interposed between the window glass and the window frame , wherein the window frame includes an opening portion , and a joining portion formed along an inner periphery of the opening portion and bonded to an outer periphery of the window glass , the window glass includes a plurality of corner portions formed in corner regions in the outer periphery of the window glass , and connection side portions formed in the outer periphery of the window glass and connecting the adjacent corner portions to one another, the adhesive portion includes first adhesive portions interposed between the corner portions of the window glass and the joining portion of the window frame , and second adhesive portions interposed between the connection side portions of the window glass and the joining portion of the window frame , adhesion force per unit peripheral length in the first adhesive portions is greater than adhesion force per unit peripheral length in the second adhesive portions , and the joining portion includes a flange portion formed over the entire inner periphery of the opening portion , characterized in that the joining portion further includes extending portions formed to protrude inward from the flange portion only at positions corresponding to the corner portions of the window glass , and the first adhesive portions are provided on the flange portion and the extending portions , and the second adhesive portions are provided on the flange portion . a window frame formed in a vehicle body ; a window glass supported on the window frame ; and an adhesive portion interposed between the window glass and the window frame , wherein the window frame includes an opening portion , and a joining portion formed along an inner periphery of the opening portion and bonded to an outer periphery of the window glass , the window glass includes a plurality of corner portions formed in corner regions in the outer periphery of the window glass , and connection side portions formed in the outer periphery of the window glass and connecting the adjacent corner portions to one another, the adhesive portion includes first adhesive portions interposed between the corner portions of the window glass and the joining portion of the window frame , and second adhesive portions interposed between the connection side portions of the window glass and the joining portion of the window frame , adhesion force per unit peripheral length in the first adhesive portions is greater than adhesion force per unit peripheral length in the second adhesive portions , and the joining portion includes a flange portion formed over the entire inner periphery of the opening portion , characterized in that the joining portion further includes extending portions formed to protrude inward from the flange portion only at positions corresponding to the corner portions of the window glass , and the first adhesive portions are provided on the flange portion and the extending portions , and the second adhesive portions are provided on the flange portion . <EOS>