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Koizumi married 21-year-old university student Kayoko Miyamoto in 1978. The couple had been formally introduced to each other as potential spouses, a common practice known as "omiai". The wedding ceremony at the Tokyo Prince Hotel was attended by about 2,500 people, including Takeo Fukuda (then Prime Minister), and featured a wedding cake shaped like the National Diet Building. The marriage ended in divorce in 1982, as Kayoko was reportedly unhappy with her married life for several reasons. After this divorce, Koizumi never married again, saying that divorce consumed ten times more energy than marriage.