A connector with retainer includes a housing (20) configured such that terminal fittings (10) are inserted thereinto from behind, and a front retainer (40) to be mounted into the housing (20) from front. The housing (20) includes locking lances (31) capable of locking the terminal fittings (10) inserted to a proper position. The locking lances (31) are cantilevered forward. The front retainer (40) includes ribs (45) configured to enter spaces (S2) lateral to the locking lances (31). The ribs (45) are disposed in a height range of locking portions (32) of the locking lances (31) to be locked to the terminal fittings (10).