An acrylic elastomer composition containing: 100 parts by mass of an acrylic elastomer; and 2 to 15 parts by mass of at least one of a plasticizer represented by the chemical formula (1):

wherein R 1 , R 2 , R 3 , and R 4 each represent an alkyl group having 4 to 18 carbon atoms, and R 1 , R 2 , R 3 , and R 4 may be the same alkyl group or may be different from each other, and wherein the acrylic elastomer contains 0.1 to 5 parts by mass of a crosslinking monomer unit with respect to 100 parts by mass of an acrylic acid alkyl ester unit.