An apparatus for controlling an adaptive drive beam mode vehicle headlamp (47, 52) of a subject vehicle travelling a road having reflective walls (105, 105') on its sides, comprising: a headlamp driver (46, 51) adapted to drive said vehicle headlamp (47, 52); a forward vehicle determining section adapted to determine whether or not a forward vehicle is travelling ahead of said subject vehicle; a vehicle driving state determining section adapted to determine whether a driving state of said subject vehicle is straight or curved, when it is determined that said forward vehicle is travelling ahead of said subject vehicle; and a curved-mode illumination intensity pattern outputting section adapted to output a curved-mode illumination intensity pattern (P c) to said headlamp driver (46, 51), when it is determined that the state of said subject vehicle is curved, said curved-mode illumination intensity pattern (P c) having first illumination intensities (111, 112, 113, 114, 115) aimed toward said forward vehicle, said first illumination intensities being decreased to form a first light shielding region, and having second illumination intensities (11, 12, I3, 14, 15, I6, 17, 18, I9, 110; I16, I17, 118, 119, 120, 121, 122, 123, 124, 125) of areas adjacent to at least one side of said first light shielding region, said second illumination intensities (I1, 12, 13, 14, I5, 16, 17, I8, 19, 110; I16, I17,118, I19, 120, 121, 122, 123, 124, 125) being stepwise or continuously increased away from said first light shielding region to a reference value (V REF) smaller than a maximum value (V MAX) defined by said vehicle headlamp, said apparatus further comprising a straight-mode illumination intensity pattern outputting section adapted to output a straight-mode illumination intensity pattern (P s) to said headlamp driver (46, 51), when it is determined that the state of said subject vehicle is straight, said straight-mode illumination intensity pattern (P s) having fifth illumination intensities (I11, I12, 113, 114, 115) aimed toward said forward vehicle, said fifth illumination intensities being decreased to form a third light shielding region, and having sixth illumination intensities (I1, I2, I3, I4, 15, 16, 17, I8, I9, 110; 116, I17, 118, 119, 120, 121, 122, 123, 124, I25) of areas adjacent to said fifth light shielding region, said sixth illumination intensities (19, 110; 116, I17) immediately close to said third light shielding region being larger than said reference value (V REF). a headlamp driver (46, 51) adapted to drive said vehicle headlamp (47, 52); a forward vehicle determining section adapted to determine whether or not a forward vehicle is travelling ahead of said subject vehicle; a vehicle driving state determining section adapted to determine whether a driving state of said subject vehicle is straight or curved, when it is determined that said forward vehicle is travelling ahead of said subject vehicle; and a curved-mode illumination intensity pattern outputting section adapted to output a curved-mode illumination intensity pattern (P c) to said headlamp driver (46, 51), when it is determined that the state of said subject vehicle is curved, said curved-mode illumination intensity pattern (P c) having first illumination intensities (111, 112, 113, 114, 115) aimed toward said forward vehicle, said first illumination intensities being decreased to form a first light shielding region, and having second illumination intensities (11, 12, I3, 14, 15, I6, 17, 18, I9, 110; I16, I17, 118, 119, 120, 121, 122, 123, 124, 125) of areas adjacent to at least one side of said first light shielding region, said second illumination intensities (I1, 12, 13, 14, I5, 16, 17, I8, 19, 110; I16, I17,118, I19, 120, 121, 122, 123, 124, 125) being stepwise or continuously increased away from said first light shielding region to a reference value (V REF) smaller than a maximum value (V MAX) defined by said vehicle headlamp, said apparatus further comprising a straight-mode illumination intensity pattern outputting section adapted to output a straight-mode illumination intensity pattern (P s) to said headlamp driver (46, 51), when it is determined that the state of said subject vehicle is straight, said straight-mode illumination intensity pattern (P s) having fifth illumination intensities (I11, I12, 113, 114, 115) aimed toward said forward vehicle, said fifth illumination intensities being decreased to form a third light shielding region, and having sixth illumination intensities (I1, I2, I3, I4, 15, 16, 17, I8, I9, 110; 116, I17, 118, 119, 120, 121, 122, 123, 124, I25) of areas adjacent to said fifth light shielding region, said sixth illumination intensities (19, 110; 116, I17) immediately close to said third light shielding region being larger than said reference value (V REF).