In May or June (April in old lunar calendar), 1573, he reverted to the Takeda family name, took over as head of the family, and became the twentieth family head of the Takeda clan because Shingen died of illness during the operation of advancing to the capital (Kyoto).
元亀4年（1573年）4月、信玄が上洛作戦の途中で病死したため、武田姓に復し、家督を相続し、武田氏第20代当主となる。