To provide a hot-rolled seamless steel tube manufacturing method capable of preventing generation of flaws in an inner surface of a steel tube by preventing end cracks generated during the gas cutting, and high is yield and mass productivity.

In a hot-rolled seamless steel tube manufacturing step, when a stock tube is gas-cut before the piercing, the stock tube is heated to the temperature of ≥200°C and <300°C before the gas cutting, and generation of flaws in the inner surface of the steel tube after the piercing is prevented by performing the gas cutting after reducing the effect caused by generation of the stress in the stock tube in θ direction shown in Fig. 1.