PROBLEM TO BE SOLVED: To provide a medicament capable of reducing the amount of GM-CSF in a living body by suppressing proliferation of target T cells producing GM-CSF or suppressing its GM-CSF producing ability.SOLUTION: According to the present invention, there is provided a GM-CSF producing T cell-regulating agent comprising as an active ingredient a glycolipid compound represented by formula (I) or a salt thereof. (Ris an aldopyranose residue; Ris H or OH; Ris CH; CH(OH)-CH, or CH=CH; Ris H or CH; x is an integer from 0 to 35; y and z are integers satisfying y+z=0 to 3)SELECTED DRAWING: None【課題】GM-CSFを産生する標的T細胞の増殖を抑制、又はそのGM-CSF産生能を抑制することで、生体内におけるGM-CSF量を低減することのできる薬剤の提供。【解決手段】式(I)で示される糖脂質化合物又はその塩を有効成分として含有するGM-CSF産生T細胞制御剤。(R1はアルドピラノース残基;R2はH又はOH;R3はCH2、CH(OH)-CH2、又はCH=CH;R4はH又はCH3;xは0~35の整数;y及びzはy+z=0~3を満たす整数)【選択図】なし