Closing assembly of a vehicle body opening

The assembly has a fixed panel made of glass and with upper and lower parts (11, 13), where the part (13) closes a major part of a bay surface. A security device (15) retains a shutter (12), fixed and movable sections (142, 141) and an upper part (11) with each other. The section (142) is mounted by closely overlapping on an edge of an opening. The device (15) is integrated with the section (142) and the part (11).