Provided is a side piece structure of a pair of glasses, including at least one temple and at least one side plate. The at least one temple includes a slot, a fastener hole, a pivot hole and a first mark. The at least one side plate includes a bracket, a fastener bump, a pivot, a second mark and a side cover. The pivot is inserted into the pivot hole, and then the fastener bump is engaged with the fastener hole. The bracket is fitted into the slot, and then the first mark is aligned with the second mark.