Rust-preventive composition and automobile component

A rust-preventive composition comprising:

• a rust-preventive additive;
• a wax having a melting point within a range of 60° C. to 130° C. selected from microcrystalline waxes and polyethylene-based or polypropylene-based synthetic waxes;
• bentonite;
• a hydrogenated oil;
• and two or more kinds of diluents having different viscosities;
• the rust-preventive additive being contained in an amount within a range of 12% by mass to 39% by mass with respect to the total composition, the bentonite being contained in an amount within a range of 2% by mass to 6% by mass with respect to the total composition, and the wax being contained in an amount within a range of 3% by mass to 13% by mass with respect to the total composition, wherein
• a diluent having a lowest viscosity among the two or more kinds of diluents having different viscosities is contained in an amount within a range of 40% by mass to 80% by mass with respect to the total amount of diluents, and
• the diluent having the lowest viscosity among the two or more kinds of diluents having different viscosities has a kinematic viscosity within a range of 10 mm2/s to 30 mm2/s at 40° C., and wherein
• a diluent having a highest viscosity among the two or more kinds of diluents has a kinematic viscosity of 50 mm2/s or more.