MAGNETIC MARKER, MAGNETIC MARKER RETAINING METHOD, WORK APPARATUS FOR MAGNETIC MARKERS, AND MAGNETIC MARKER INSTALLATION METHOD

A magnetic marker retaining method that includes placing a plurality of sheet-shaped magnetic markers on a surface of a band-shaped carrier sheet, the plurality of sheet-shaped magnetic markers being so as to be spaced in a longitudinal direction of the band-shaped carrier sheet; and retaining the plurality of sheet-shaped magnetic markers in a state of a roll body with the band-shaped carrier sheet rolled up in a roll shape, the band-shaped carrier sheet being rolled up such that each surface of the plurality of sheet-shaped magnetic markers directly contacts the other side of the surface of the band-shaped carrier sheet, on which the plurality of sheet-shaped magnetic markers are placed, and the plurality of sheet-shaped magnetic markers being to be laid on a road.