Abstract: An electric connector including a housing, at least one terminal reception chamber formed in the housing for receiving a terminal, a flexible member provided in the terminal reception chamber so as to serve as a primary locking portion which permits only insertion of the terminal and which engages with a primary engagement portion formed on the terminal to thereby lock the terminal from coming off, a retainer fitted to a fitting groove formed in an upper surface of the housing, and a secondary locking portion formed in the retainer and having a locking piece which is arranged so as to project into the terminal reception chamber when the retainer is fitted to the housing and engage with a secondary engagement portion of the terminal to thereby lock the terminal from coming off, wherein the fitting groove is provided so as to extend to a side wall surface of the terminal reception chamber which is located on at least one side portion of the housing; and the secondary engagement portion has a pair of engagement