The aim of this paper is to investigate the effects of hardfacing thickness on wear characteristics of Stellite21 hardfaced STD 61 hot-working tool steel at the elevated temperature. Stellite21 super-alloy is deposited on the STD61 hot-working tool steel to fabricate the specimen using a laser-aided direct metal rapid tooling process. Several pin-on-disk wear experiments are carried out at temperatures beyond the full annealing temperature of the STD61. The hardness, the friction induced work hardening, the weight loss, the wear depth, and the wear width of each specimen are measured to quantitatively investigate the influence of the hardfacing thickness on the wear characteristics. The variation of friction characteristics of the worn region according to the hardfacing thickness is examined via the measurement of friction coefficients and the observation of morphologies of the worn regions for different specimens. From the results of these investigations, the proper thickness of the Stellite21 hardfaced layer on STD61 hot-working tool steel is estimated.