To provide a cast-in material having high joined strength.

An aluminum shape 1 and an aluminum casting 5 arranged at the outside of the aluminum shape 1, are provided, and the aluminum shape 1 is a cylindrical material 11 having 650°C melting point. A fin 3 projected to the outside from the outer surface 1a in the longitudinal direction of the cylindrical material 11 is arranged and a thin thickness part 2 melted with the melting heat of the aluminum casting 5, is provided at the base in the longitudinal direction of the fin 3. The aluminum casting 5 is formed as arbitrary shape at 580-600°C melting point and the contact part 6 with the thin thickness part 2 is fused and solidified with the thin thickness part 2 and penetrated into the fin 3.