An in-vehicle seat includes a seat back, a seat cushion, and an anchor for fixing a child seat. The seat cushion has a seat cushion base, a seat cushion pad that is removable from the seat cushion, and a supporting panel. The supporting panel is provided between the seat cushion base and the seat cushion pad, and serves as a placement face for the child seat. The anchor is provided at a position at which the anchor is covered and hidden by the seat cushion pad, and at which the anchor is externally exposed when the seat cushion pad is removed from the seat cushion. A guide groove that guides a linking portion protruding from the child seat to the anchor is provided in the supporting panel.