SOLIDIFICATION POSITION MEASUREMENT DEVICE, SOLIDIFICATION POSITION MEASUREMENT METHOD, METAL MATERIAL QUALITY MANAGEMENT METHOD, CASTING EQUIPMENT, METAL MATERIAL MANUFACTURING EQUIPMENT, AND METAL MATERIAL MANUFACTURING METHOD

An object of the present invention is to make it possible to continuously and automatically measure a solidification position of a cast-piece by preventing damage and burning of an electromagnetic ultrasonic sensor due to a decrease in lift-off caused by a fluctuation in the thickness of the cast-piece, and preventing a decrease in sensitivity of the electromagnetic ultrasonic sensor due to an increase in lift-off. A solidification position measuring apparatus includes: electromagnetic ultrasonic sensors 7 and 8 installed outside a cast-piece 1; a sensor lifting and lowering unit configured to adjust a gap between the cast-piece 1 and the electromagnetic ultrasonic sensor 7; a gap measuring unit configured to measure the gap between the cast-piece 1 and the electromagnetic ultrasonic sensor 7; a measuring unit configured to estimate a solidification position in the cast-piece 1 from an output of the electromagnetic ultrasonic sensor 7; and a drive control unit configured to drive and control the sensor lifting and lowering unit and the gap measuring unit. The drive control unit is configured to control a position of the electromagnetic ultrasonic sensor 7 by the sensor lifting and lowering unit based on the gap measured by the gap measuring unit.