此次世博会中日本希望展现其健康、 绿色的饮食文化及平衡的日常膳食， 以及对抗饥饿和国际生态问题的解决办法。 同时， 日本也希望趁此次机会， 拯救2011年日本地震后低迷的旅游及商业。
日本此次围绕健康和寓教于乐两个主题。 日本的传统食物 – 米饭、 生鱼片、 和蔬菜的组合是平衡膳食的典范， 与之对立的是世界上十几亿饮食过量的肥胖人群。 日本开展学校项目， 将食品分享与杜绝浪费灌输给下一代。
自2005年以来， 政府一直致力于教育民众食品营养知识， 且向国际教科文组织申请将日本传统美食列入人类文化保护遗产。从食品保存到食品运输及分销过程中和谐（环境及审美）和科技也是主题中的一部分。
“Utsuwa”指日本各种风格的传统陶器。日本展馆象征日本文化的浓厚底蕴及现代化。 4179平米的展馆面积内通过日本传统建筑特色 - 宽敞的入口， 细长的通道， 来表达出传统与现代、 环保及美观的结合。 展馆运用竹子和木材等自然建材， 结合高科技和节能设备。 展馆内安排一系列活动， 使得游客通过多重感官感受日本美食文化。
Theme "Harmonious Diversity"
Japan joins Expo Milano 2015 with the aim of proposing its food culture as an example of a healthy, sustainable and balanced diet, and as a model that can alleviate the problems of hunger and global ecology. By the same token, it also sees this event as the perfect opportunity for promoting its image following the 2011 earthquake, encouraging tourism and business opportunities.
Japan’s participation unfurls essentially around two words: Health and Edutainment, or educational entertainment. Its typical dishes, based on rice, raw fish and vegetables are proposed as a balanced way of eating, contrasting with the excesses that can lead to obesity for a billion people. Projects for schools are also a vehicle for traditional concepts encouraging sharing and discouraging wastefulness.
The government has been working since 2005 to educate families on food awareness and seeks recognition from UNESCO for the Japanese diet as a cultural heritage of humanity. Harmony (environmental and aesthetic) and technology, are added to these themes, articulating elements of food preservation on the one hand, and transport systems and food distribution on the other.
"Utsuwa" is the term to describe the traditional Japanese ceramics that are characterized by many different styles, and likewise, its pavilion symbolizes the wealth and the multiplicity of Japan’s culture. Representing the fusion between tradition and modernity, environmental and aesthetic perfection, Japan proposes a pavilion that spreads over an exhibition area of 4,170 square meters, with a wide entrance and lengthwise orientation, like one of the traditional houses of Kyoto. In addition to the use of natural materials such as bamboo and wood, it makes use of technologies and systems for energy conservation. Furthermore, a range of events and installations stimulate the five senses, allowing visitors to fully experience Japan’s food culture.