PROBLEM TO BE SOLVED: To provide a bone mineral density measuring device capable of preventing a bone mineral density from being measured by users hand on the side different from specifications of measurement on the bone mineral density without users intention.SOLUTION: A detecting part 27 detects a deficient part of an aluminum scale included in a radiographic image G0. A determination part 28 performs a first determination on whether or not a hand existing at the side of the deficient part of the aluminum scale is a left hand. When the first determination is affirmative, a region extract part 22 specifies a measurement region in this left hand. When the first determination is negative, the determination part 28 performs a second determination on whether or not only left or right hand is included in the radiographic image. When the second determination is negative, a warning is given. When the second determination is affirmative, a measurement region is specified in the right hand or the left hand.
