A terminal fitting (10) is provided with a box-shaped main portion (11) capable of receiving a tab (61) of a mating terminal fitting (60) and a resiliently deformable resilient contact piece (12) arranged in the main portion (11) to be connected to the tab (61) inserted into the main portion (11). The resilient contact piece (12) includes a supporting portion (40) for resilient deformation in the main portion (11). The main portion (11) includes a base portion (18) facing the resilient contact piece (12) in a resilient deforming direction of the resilient contact piece (12). The base portion (18) includes a recess (46) formed within the thickness range thereof the base portion (18), and the supporting portion (40) is in contact with the bottom surface of the recess (46).