A connector includes: a housing; a plurality of terminal chambers formed in the housing along a longitudinal direction thereof to accommodate terminals therein; a spacer insertion hole formed in the housing along a height direction thereof perpendicular to the longitudinal direction to communicate with the terminal chambers through communication holes and allow an insertion of a spacer for engaging with the terminals, each of the communication holes formed so as to communicate each of the terminal chambers with an outside of the housing, and forming a depression on an underside of each terminal chamber; and a guide protrusion formed about an upstream-side edge of each of the communication holes in an inserting direction of the terminal to lead a front end of the terminal inserted into the terminal chamber toward an upside of a downstream-side edge of each communication hole in the inserting direction.