Anti-B7-H4 antibody

A bispecific antibody comprising any one of following regions (a) to (c) that specifically bind to an extracellular domain of a human B7-H4 protein composed of a region from Leu25 to Ser259 of SEQ ID NO:

• 33, and a heavy chain variable region and a light chain variable region that specifically bind to an effector cell antigen:
• (a) a heavy chain variable region comprising the amino acid sequence of SEQ ID NO:
• 4 and a light chain variable region comprising the amino acid sequence of SEQ ID NO:
• 6;
• (b) a heavy chain variable region comprising the amino acid sequence of SEQ ID NO:
• 4 and a light chain variable region comprising the amino acid sequence of positions 4 to 104 of SEQ ID NO:
• 6;
• and
• (c) a heavy chain variable region comprising the amino acid sequence of positions 3 to 111 of SEQ ID NO:
• 4 and a light chain variable region comprising the amino acid sequence of positions 4 to 104 of SEQ ID NO:
• 6.