A terminal fitting (3) has a tubular main portion (6), and a stabilizer (17) embossed to project out from a side wall (6B) of the main portion (6). The stabilizer (17) can be received in a guiding recess (18) in a cavity (2). A resilient tongue (14) is folded back from the front of a bottom wall (6A) of the main portion (6) and into the main portion (6). Preventing pieces (14B) bulge from widthwise edges of the tongue (14). One preventing piece (14B) is engageable with a first preventing portion (16A) made in the side wall (6B) upon forming the stabilizer (17). Accordingly, the stabilizer (17) and the first preventing portion (16A) can be at the same site, which contributes to the miniaturization and increases locations where other parts can be formed.