In this paper, the author discussed the significance of Marcel's philosophy of hope for modern medicine and nursing in the following four parts. I. Healing power of hope According to Marcel, hope can sometimes become a real factor in the cure. What kind of hope could be a factor in the cure ? The Marcel's answer to this question is "intersubjective hope". II. Hope as a patient's mental attitude toward his or her incurable disease Of various mental attitudes that patients may take toward their incurable disease, Marcel called "positive non-acceptance with patience" hope. This mental attitude is similar to some degree to "Shobyo", the living-with-disease attitude, which is emphasized by Noo-psychosomatic Medicine. III. Hope of people surrounding a patient Marcel defined surrounding people's hope for the recovery of their beloved sick person as "hope against statistic probalility". Advancing this definitoin further, I think that having this "hope against statistic probalility" is physician's virtue. IV. Marcel's philosophy of hope and nursing Mutuality, the concept of hope developed by Marcel, was introduced to two Hope Scales developed by two nursing specialists in the United States, J. F. Miller and M. H. Stoner. In a true sence, however, Malcel's concept means not only to measure patient's hope objectively but also to think about nurse's hope as their attitude. M. C. Vaillot analyzed a case in which nurse's hope resuscitated a patinet who was in a critical condition using Marcel's philosophy.