Abstract: In a half-fitting prevention connector (1), a compression spring (20) is employed as a resilient member for preventing half-fitting between a male connector (2) and a female connector (3). The compression spring (20) is attachable to a housing (26) of the female connector (3) and includes a first bent portion (21)(formed into a substantially U-shape by bending a strip-shaped plate, a second bent portion (23) continuing from the first bent portion (21) and formed into a substantially V-shape by bending the strip-shaped plate, a fixing hole (24) located at a rear portion of the compression spring (20) and retained by a fixing projection (32), and a fixing rolled portion (25) located at the rear portion of the compression spring (20) and retained by pressing pieces (33).