A biometric information correcting apparatus comprising: a palm print feature point extracting unit that extracts a point on a first principal line of a palm print and a point on a second principal line of the palm print, as two feature points (K, S), from a first image obtained by capturing the palm print and representing the palm print; and a correcting unit that rotates a vein pattern of the hand on a second image or a feature portion of the vein pattern extracted from the second image, according to an orientation of a line joining the two feature points, the second image being obtained by a biometric information acquiring unit capturing the vein pattern, wherein, the palm print feature point extracting unit detects a hand region including the palm print on the first image, extracts a first end point of the first principal line at a position closer to a first end left-side boundary of the hand region, and extracts a second end point of the second principal line at a position closer to a second end right-side boundary of the hand region on a side opposite to the first end left-side boundary, when the first principal line intersects the first end left-side boundary, and the second principal line intersects the second end right-side boundary, the palm print feature point extracting unit extracts the first end point and the second end point as the two feature points (K, S), and characterized in that, when the first principal line and the first end left-side boundary do not intersect each other, or the second principal line and the second end right-side boundary do not intersect each other, the palm print feature point extracting unit extracts a tangent point of a first tangent line to a first curve obtained by approximating the first principal line as one of the two feature points (K, S), and a tangent point of a second tangent line to a second curve obtained by approximating the second principal line as the other one of the two feature points (K, S), the first tangent line and the second tangent line being included in a pair of tangent lines and being selected as forming a smallest angle with each other among pairs of a tangent line to the first curve and a tangent line to the second curve, respectively. a palm print feature point extracting unit that extracts a point on a first principal line of a palm print and a point on a second principal line of the palm print, as two feature points (K, S), from a first image obtained by capturing the palm print and representing the palm print; and a correcting unit that rotates a vein pattern of the hand on a second image or a feature portion of the vein pattern extracted from the second image, according to an orientation of a line joining the two feature points, the second image being obtained by a biometric information acquiring unit capturing the vein pattern, wherein, the palm print feature point extracting unit detects a hand region including the palm print on the first image, extracts a first end point of the first principal line at a position closer to a first end left-side boundary of the hand region, and extracts a second end point of the second principal line at a position closer to a second end right-side boundary of the hand region on a side opposite to the first end left-side boundary, when the first principal line intersects the first end left-side boundary, and the second principal line intersects the second end right-side boundary, the palm print feature point extracting unit extracts the first end point and the second end point as the two feature points (K, S), and characterized in that, when the first principal line and the first end left-side boundary do not intersect each other, or the second principal line and the second end right-side boundary do not intersect each other, the palm print feature point extracting unit extracts a tangent point of a first tangent line to a first curve obtained by approximating the first principal line as one of the two feature points (K, S), and a tangent point of a second tangent line to a second curve obtained by approximating the second principal line as the other one of the two feature points (K, S), the first tangent line and the second tangent line being included in a pair of tangent lines and being selected as forming a smallest angle with each other among pairs of a tangent line to the first curve and a tangent line to the second curve, respectively.