A connector includes a terminal, a housing, a waterproofing member and a waterproofing member cover. The waterproofing member includes a cylindrical sealing portion in which an insertion hole for the terminal is formed, and a guide portion disposed at least on a rear side in a terminal insertion direction in the insertion hole of the sealing portion and having a tapered shape so as to guide the terminal toward the insertion hole. The waterproofing member includes an elastically-deformable thin portion in a periphery of the sealing portion so that weight generated when the terminal guided to the insertion hole by the guide portion expands the insertion hole is larger than weight necessary for moving the sealing portion in a direction perpendicular to the terminal insertion direction.