Erbin belongs to the LAP protein family. It represents a novel type of adaptor protein that features targeting of basolateral localization of the Her2 receptor through direct binding to the Her2 C terminus. Recent studies demonstrated that Erbin could inhibit the Ras-mediated activation of the mitogen-activated protein kinase (MAPK), nuclear factor-κB (NF-κB) and transforming growth factor β (TGF-β) signaling pathways. It suggests that Erbin may function as a signaling molecule. The functions of Erbin in determining cell polarity and cell adhesion have been well described. This review mainly focuses on the recent findings in regulation of signaling pathways by Erbin.