To provide a method for annealing tool steel capable of obtaining an annealed structure in which carbides are uniformly dispersed in a short time.

By hot rolling or heating to ≥ an austenitizing temp., the austenite grain size is controlled to ≤50 μm, and thereafter, it is cooled to a temp. between a pearlite nose temp. and a bainite transformation starting temp. at a cooling rate of ≥300°C/hr, is subsequently heated to a temp. between the pearlite nose temp. and the Ac1 transformation point and is subjected to spheroidizing.