Elastic member and wire for elastic member

An elastic member formed of a wire having a substantially circular cross section orthogonal to a longitudinal direction, the elastic member being expandable and contractible in a predetermined direction and comprising:

• a first alloy portion made of an aluminum alloy having a tensile strength larger than 950 MPa and equal to or less than 1100 MPa at room temperature;
• and
• a second alloy portion configured to cover the first alloy portion, the second alloy portion having a thickness in a radial direction smaller than a radius of the first alloy portion, and being made of an aluminum alloy having a tensile strength of 100 MPa to 650 MPa at room temperature,
• wherein the second alloy portion is formed of aluminum alloys being layered over one another, the aluminum alloys having different compositions from one another.