The present invention relates to an antibody that specifically reacts with hTROP-2 and has anti-tumor activity in vivo (particularly a humanized antibody), a hybridoma that produces the antibody, a complex of the antibody and a drug, and a tumor diagnosis Alternatively, a therapeutic pharmaceutical composition, a tumor detection method, and a tumor detection or diagnostic kit are provided.本発明は、hTROP-2と特異的に反応しin vivoで抗腫瘍活性を有する抗体(特にヒト型化抗体)、当該抗体を産生するハイブリドーマ、当該抗体と薬剤との複合体、腫瘍の診断用又は治療用医薬組成物、腫瘍の検出方法、腫瘍の検出用又は診断用キットを提供する。