A pillar mounting device for manufacturing a glass panel unit, the pillar mounting device comprising: a sheet for forming pillars for a glass panel unit, the sheet comprising a base material having a sheet-like shape, the base material having a plurality of loop-shaped grooves, the base material having a plurality of portions serving as the pillars, each of the plurality of portions being surrounded by a corresponding one of the plurality of loop-shaped grooves, and the base material including a plurality of resin layers, a punch configured to punch at least one of the plurality of portions from the base material of the sheet to form at least one pillar, and a movement mechanism configured to move the at least one pillar to a surface of a substrate including a glass pane, and characterised in that (a) the movement mechanism includes at least one suction pin included in the punch, the at least one suction pin being configured to: punch the at least one of the plurality of portions from the base material to form the at least one pillar, and then move the at least one pillar to the surface of the substrate with the at least one pillar being sucked up by the at least one suction pin, or in that (b) the movement mechanism includes a suction tool configured to suck up the at least one pillar. a sheet for forming pillars for a glass panel unit, the sheet comprising a base material having a sheet-like shape, the base material having a plurality of loop-shaped grooves, the base material having a plurality of portions serving as the pillars, each of the plurality of portions being surrounded by a corresponding one of the plurality of loop-shaped grooves, and the base material including a plurality of resin layers, a punch configured to punch at least one of the plurality of portions from the base material of the sheet to form at least one pillar, and a movement mechanism configured to move the at least one pillar to a surface of a substrate including a glass pane, and characterised in that (a) the movement mechanism includes at least one suction pin included in the punch, the at least one suction pin being configured to: punch the at least one of the plurality of portions from the base material to form the at least one pillar, and then move the at least one pillar to the surface of the substrate with the at least one pillar being sucked up by the at least one suction pin, or in that (b) the movement mechanism includes a suction tool configured to suck up the at least one pillar. (a) the movement mechanism includes at least one suction pin included in the punch, the at least one suction pin being configured to: punch the at least one of the plurality of portions from the base material to form the at least one pillar, and then move the at least one pillar to the surface of the substrate with the at least one pillar being sucked up by the at least one suction pin, or in that punch the at least one of the plurality of portions from the base material to form the at least one pillar, and then move the at least one pillar to the surface of the substrate with the at least one pillar being sucked up by the at least one suction pin, or in that (b) the movement mechanism includes a suction tool configured to suck up the at least one pillar.