In S102, after preforming a pressed powder member by compressing metal powder filled in a press-forming portion, the pressed powder member and metal member are slid to each other in S103. In S104, after temporarily joining the pressed powder member and the metal member by further pressurizing the powder member, the temporary joined pressed powder member and the metal member are sintered in a sintering furnace, and the pressed powder member and the metal member are joined by sintering diffusion in S105. Thereby, joining areas between the pressed powder member and the metal member are increased, and it is possible to improve a joining strength between the pressed powder member and the metal member.