A dissimilar material solid phase bonding method is disclosed wherein one member and another member having different compositions are brought into contact with one another by way of an insert material to form an interface (1) to be bonded, at which the one member and the insert material are in contact with one another, and an interface (2) to be bonded, at which the other member and the insert material are in contact with one another; the temperature of the interface (1) to be bonded and the interface (2) to be bonded is raised by means of frictional heat and/or by electrical heating; a bonding pressure (1) is applied substantially perpendicular to the interface (1) to be bonded; a bonding pressure (2) is applied substantially perpendicular to the interface (2) to be bonded; and the bonding pressure (1) and the bonding pressure (2) are set to different values.