An oil-based hair cosmetic material comprising a dibasic acid ester compound of general formula: wherein R 1 is an alkylene group having a carbon number of 2-4, which may be mono- or poly-substituted, R 2 and R 3 are, independently of one another, an alkyl group having a carbon number of 1-4, which may be mono- or poly-substituted, R 4 and R 5 are, independently of one another, hydrogen or a methyl group or ethyl group which may be mono- or poly-substituted, m and n are, independently of one another, an integer of 0-4 with m+n≥1 provided that the cases wherein R 2 and R 3 are both an ethyl group and m and n are both 1 are excluded, and one or more oil agents selected from the group consisting of isododecane, isohexadecane, cyclic silicone oils such as decamethylcyclopentasiloxane, ozokerite, squalane, squalene, ceresin, paraffin, isoparaffin, paraffin wax, liquid paraffin, pristane, polyisobutylene, polyisobutene, hydrogenated polyisobutene, microcrystalline wax, polyethylene wax, vaselline, avocado oil, perilla oil, olive oil, cocoa butter, Japanese Torreya oil, apricot kernel oil, hydrogenated oil, wheat germ oil, sesame oil, rice germ oil, rice bran oil, sugarcane wax, sasanqua oil, safflower oil, shea butter, Paulownia (wood) oil, cinnamon oil, soybean oil, tea seed oil, camellia oil, evening primrose oil, corn oil, rapeseed oil, germ oil, palm oil, palm kernel oil, castor oil, hydrogenated castor oil, sunflower oil, grape oil, jojoba oil, macadamia nut oil, bees wax, cotton seed oil, cotton wax, Japan wax, montan wax, coconut oil, hydrogenated coconut oil, groundnut oil, lanolin, liquid lanolin, reduced lanolin, lanolin alcohol, hard lanolin, lanolin acetate, lanolin fatty acid isopropyl, hexyl laurate, silicone compounds such as dimethyl polysiloxane, methylphenyl polysiloxane, alkyl-modified organopolysiloxane, end-modified organopolysiloxane, fluorine-modified organopolysiloxane, amodimethicone, amino-modified organopolysiloxane, volatile silicone and alkyldimethicone, wherein no water is formulated. a dibasic acid ester compound of general formula: wherein R 1 is an alkylene group having a carbon number of 2-4, which may be mono- or poly-substituted, R 2 and R 3 are, independently of one another, an alkyl group having a carbon number of 1-4, which may be mono- or poly-substituted, R 4 and R 5 are, independently of one another, hydrogen or a methyl group or ethyl group which may be mono- or poly-substituted, m and n are, independently of one another, an integer of 0-4 with m+n≥1 provided that the cases wherein R 2 and R 3 are both an ethyl group and m and n are both 1 are excluded, and one or more oil agents selected from the group consisting of isododecane, isohexadecane, cyclic silicone oils such as decamethylcyclopentasiloxane, ozokerite, squalane, squalene, ceresin, paraffin, isoparaffin, paraffin wax, liquid paraffin, pristane, polyisobutylene, polyisobutene, hydrogenated polyisobutene, microcrystalline wax, polyethylene wax, vaselline, avocado oil, perilla oil, olive oil, cocoa butter, Japanese Torreya oil, apricot kernel oil, hydrogenated oil, wheat germ oil, sesame oil, rice germ oil, rice bran oil, sugarcane wax, sasanqua oil, safflower oil, shea butter, Paulownia (wood) oil, cinnamon oil, soybean oil, tea seed oil, camellia oil, evening primrose oil, corn oil, rapeseed oil, germ oil, palm oil, palm kernel oil, castor oil, hydrogenated castor oil, sunflower oil, grape oil, jojoba oil, macadamia nut oil, bees wax, cotton seed oil, cotton wax, Japan wax, montan wax, coconut oil, hydrogenated coconut oil, groundnut oil, lanolin, liquid lanolin, reduced lanolin, lanolin alcohol, hard lanolin, lanolin acetate, lanolin fatty acid isopropyl, hexyl laurate, silicone compounds such as dimethyl polysiloxane, methylphenyl polysiloxane, alkyl-modified organopolysiloxane, end-modified organopolysiloxane, fluorine-modified organopolysiloxane, amodimethicone, amino-modified organopolysiloxane, volatile silicone and alkyldimethicone,