PROBLEM TO BE SOLVED: To provide a new family of a binding protein, and a human antibody and its fragment, which have a capacity to bind to IL-18, binds with a high affinity, and neutralizes the IL-18 by binding to it.SOLUTION: The present invention includes an IL-18 binding protein, particularly an antibody which binds to a human interleukin-18 (hIL-18). Concretely, the invention relates to an antibody which is an entirely human antibody. The antibody has the high affinity for the hIL-18, and/or neutralizes an hIL-18 activity in vitro and in vivo. The antibody can be of a full-length or an antigen binding portion thereof. The method of making the antibody is also provided. The antibody, or the antibody portion is useful for detecting the hIL-18, and for medically treating a human subject suffering from a disorder in which the hIL-18 is detrimental, based on an hIL-18 activity inhibition.【課題】IL-18に結合する能力を有し、高親和性で結合し、IL-18に結合してそれを中和することができる、結合タンパク質の新規ファミリー、ヒト抗体およびその断片を提供する。【解決手段】IL-18結合タンパク質、特にヒトインターロイキン-18(hIL-18)に結合する抗体を包含するものであり、具体的には、完全にヒト抗体である抗体。hIL-18に対して高い親和性を有し、ないしはインビトロおよびインビボでhIL-18活性を中和し、全長抗体またはそれの抗原結合部分である前記抗体、および、製造方法。hIL-18の検出、並びに、hIL-18活性が有害である障害を患うヒト被験者でのhIL-18活性阻害に基づく、前記疾患の治療、のための使用。【選択図】なし