Seal structure for grommet

A seal structure comprising:

• a grommet with a cylindrical shape that is installed in an attachment panel, the grommet including an opposing surface facing an attachment surface of the attachment panel;
• and
• a bracket that presses the opposing surface of the grommet against the attachment surface of the attachment panel, wherein:
• the grommet includes a plurality of lips with an annular shape that projects from the opposing surface toward the attachment surface and form a seal between the opposing surface and the attachment surface around an entire circumference,
• the plurality of lips includes an outer lip located furthest to an outer circumference side of the plurality of lips and an inner lip located inward from the outer lip,
• a first angle formed by an inner circumferential surface of the outer lip and the attachment surface is an acute angle,
• a second angle formed by an outer circumferential surface of the outer lip and the attachment surface is greater than the first angle,
• a flat surface that faces the attachment surface is provided on an end of the outer lip and/or an end of the inner lip,
• the flat surface is between the outer circumferential surface and the inner circumferential surface of the outer lip and/or between an outer circumferential surface and an inner circumferential surface of the inner lip such the outer circumferential surface and the inner circumferential surface of the outer lip and/or the outer circumferential surface and the inner circumferential surface of the inner lip are spaced from each other at the end of the outer lip and/or the end of the inner lip.