A subframe structure (10; 500; 700), comprising: a subframe (20; 505; 710) disposed below a vehicle body structure (1; 501; 620) of a vehicle; and an extension frame (12; 503; 730) extending forward from the subframe (20; 505; 710) and configured to absorb an impact load from forward of a vehicle body, wherein the subframe (20; 505; 710) has a body part (20A; 550; 711) extending in a vehicle front-and-rear direction and a mount support part (32; 559; 690) configured to support a power train (2; 502; 604) through a mount, the body part (20A; 550; 711) is fixed to the vehicle body structure (1; 501; 620) through the mount support part (32; 559; 690), the mount support part (32; 559; 690) and the vehicle body structure (1; 501; 620) are rigidly coupled, without having an attenuating element therebetween, the vehicle body structure (1; 501; 620) includes a frontside frame (1; 501; 620) extending in the vehicle front-and-rear direction above the extension frame (12; 503; 730) and the body part (20A; 550; 711), and the subframe (20; 505; 710) is fixed to the frontside frame (1; 501; 620), characterized in that the mount support part (32; 559; 690) is provided with: an accommodating part (33; 691) configured to permit a connection of the mount with a bracket provided to the power train side and accommodate the mount therein from below; and a vehicle body attaching part (72; X2) extending upward from near the accommodating part (33; 691), a bolt of the vehicle body attaching part (72; X2) is configured to be tighten when the subframe structure (10; 500; 700) is fastened to the frontside frame (1; 501; 620), and a spacing in a vehicle width direction between an outer end part of an outer circumferential part of the accommodating part (33; 691) and a centerline of the bolt is smaller than a dimension in the vehicle width direction of the frontside frame (1; 501; 620), a dimension in the vehicle width direction of the subframe (20; 505; 710), and a diameter of the accommodating part (33; 691). a subframe (20; 505; 710) disposed below a vehicle body structure (1; 501; 620) of a vehicle; and an extension frame (12; 503; 730) extending forward from the subframe (20; 505; 710) and configured to absorb an impact load from forward of a vehicle body, wherein the subframe (20; 505; 710) has a body part (20A; 550; 711) extending in a vehicle front-and-rear direction and a mount support part (32; 559; 690) configured to support a power train (2; 502; 604) through a mount, the body part (20A; 550; 711) is fixed to the vehicle body structure (1; 501; 620) through the mount support part (32; 559; 690), the mount support part (32; 559; 690) and the vehicle body structure (1; 501; 620) are rigidly coupled, without having an attenuating element therebetween, the vehicle body structure (1; 501; 620) includes a frontside frame (1; 501; 620) extending in the vehicle front-and-rear direction above the extension frame (12; 503; 730) and the body part (20A; 550; 711), and the subframe (20; 505; 710) is fixed to the frontside frame (1; 501; 620), characterized in that the mount support part (32; 559; 690) is provided with: an accommodating part (33; 691) configured to permit a connection of the mount with a bracket provided to the power train side and accommodate the mount therein from below; and a vehicle body attaching part (72; X2) extending upward from near the accommodating part (33; 691), a bolt of the vehicle body attaching part (72; X2) is configured to be tighten when the subframe structure (10; 500; 700) is fastened to the frontside frame (1; 501; 620), and a spacing in a vehicle width direction between an outer end part of an outer circumferential part of the accommodating part (33; 691) and a centerline of the bolt is smaller than a dimension in the vehicle width direction of the frontside frame (1; 501; 620), a dimension in the vehicle width direction of the subframe (20; 505; 710), and a diameter of the accommodating part (33; 691). an accommodating part (33; 691) configured to permit a connection of the mount with a bracket provided to the power train side and accommodate the mount therein from below; and a vehicle body attaching part (72; X2) extending upward from near the accommodating part (33; 691), a bolt of the vehicle body attaching part (72; X2) is configured to be tighten when the subframe structure (10; 500; 700) is fastened to the frontside frame (1; 501; 620), and a spacing in a vehicle width direction between an outer end part of an outer circumferential part of the accommodating part (33; 691) and a centerline of the bolt is smaller than a dimension in the vehicle width direction of the frontside frame (1; 501; 620), a dimension in the vehicle width direction of the subframe (20; 505; 710), and a diameter of the accommodating part (33; 691).