Mechanical properties of pressureless sintered TiB2 containing Ni and C were investigated. Ni and C play an important role in the densification of TiB2. Sintered TiB2 containing 7.5wt% (14Ni:1.5C) exhibited a bending strength of 470MPa. Vickers hardness of 17GPa and K10 of 4.9MPam 1/2 . The fracture surface of TiB2 sintered containing Ni and C showed both transgranular and intergranular fracture modes. XRD analysis detected Ni3 B and TiC phases besides in addition to TiB2 in the sintered body.