To provide an antibody or an antigen-binding fragment thereof that is useful in testing for cancer, especially early cancer. An antibody, or an antigen-binding fragment thereof, that includes a heavy chain CDR1 including an amino acid sequence represented by SEQ ID NO: 1, a heavy chain CDR2 including an amino acid sequence represented by SEQ ID NO: 2, a heavy chain CDR3 including an amino acid sequence represented by SEQ ID NO: 3, a light chain CDR1 including an amino acid sequence represented by SEQ ID NO: 4, a light chain CDR2 including an amino acid sequence represented by SAS, and a light chain CDR3 including an amino acid sequence represented by SEQ ID NO: 6.

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