A terminal fitting (T) includes a rectangular tube (2) into which a mating terminal (M) is to be inserted. A tongue (11) is cantilevered backward in the tube (2). A support (35) struck from the bottom plate (3) to project into the rectangular tube (2) from the bottom plate (3). An auxiliary spring (15) cantilevers forward from the support (35). Opposite widthwise sides of this support (35) are continuous with the bottom plate (3). The base end part of the auxiliary spring (15) is lifted up from the bottom plate (3) by forming the support (35). Thus, the base end part does not project from the bottom plate (3) even if the auxiliary spring (15) is resiliently deformed.