A joined unit of glass base members is provided, comprising first and second glass base members and a joining member which extends along opposing surfaces of the first and second glass base members, wherein glass base member is elastically deformed while being depressed in an internal direction of the glass base member in the vicinity of an end portion in a widthwise direction of the joining member, a boundary surface between the elastically deformed glass base member and the joining member and a surface of the elastically deformed glass base member, which are disposed in the vicinity of the end portion in the widthwise direction of the joining member, are positioned on an internal side of the glass base member, and an area, in which a residual stress is a compressive stress, is formed in the vicinity of the end portion in the widthwise direction of the joining member.