A die height correcting apparatus for a press having sides formed by C-shaped frames and a slide to be driven up and down being provided on an upper portion of a press body, includes an auxiliary frame provided on the side surface of at least one of the C-shaped frame. The lower end side of the auxiliary frame is pivotably mounted on the C-shaped frame and has a free end at the upper end side, a slide position detector provided on the upper end side of the auxiliary frame, and a temperature detector provided at least on the upper end side of the auxiliary frame among the upper end side of the auxiliary frame and the slide position detector.

 

The slide is NC controlled on the basis of a slide position detected by the slide position detector, the temperature detector detects a temperature of the upper end side of the auxiliary frame among the upper end side of the auxiliary frame and the slide position detector. At least an expansion and contraction amount of the auxiliary frame among the expansion and contraction amount of the auxiliary frame and a temperature drift of the slide position detector are calculated on the basis of a temperature variation amount derived from comparison of the temperature detected by the temperature detector and a preliminarily set reference temperature to correct the command value of the NC control by adding and subtracting the calculated value to and from the command value.