There is provided a thermal displacement correction method for a machine tool, which makes it possible to more accurately correct a thermal displacement of a machining point by executing a thermal displacement estimation process individually on a movable body such as a table and taking into account a displacement of a scale and a degree of inclination of the movable body. The thermal displacement correction method includes: a thermal displacement estimating step (91) of estimating a thermal displacement of a support and a thermal displacement of the movable body independently of each other; a scale positional displacement acquiring step (92) of acquiring a displacement of an attachment position of a scale that detects a position of the movable body; a movable body actual position acquiring step (93) of acquiring an actual position (g) of the movable body relative to the support after thermal deformation of the movable body; an inclination degree computing step (94) of computing a degree (S) of inclination of the movable body at the actual position (g); a resultant displacement computing step (95) of acquiring a resultant displacement that is a resultant of the thermal displacement of the support and the thermal displacement of the movable body; a correction value computing step (96) of computing a correction value based on the resultant displacement; and a correcting step (97) of correcting a command position of the movable body based on the correction value.