A plugging-type resin cap, comprising: a cap top surface (110, 210, 310), a skirt wall (120, 220, 320) extending vertically downward from a circumferential edge of the cap top surface; an engagement rib (122, 222, 322) formed along an inner side surface of the skirt wall; and a restraining band (130, 230) tightening the skirt wall, the plugging-type resin cap being characterized by: a tab (140, 240) and engagement projections (151, 251), wherein the restraining band has an arcuate restraining portion, stoppers, and an upwardly projecting portion, the stoppers are formed to extend radially outward from circumferential both ends of the restraining portion, the upwardly projecting portion has two projecting pieces formed to extend upward from the circumferential both ends of the restraining portion and a joint joining the two projecting pieces together, the tab has a tab main body formed over an outer side surface of the skirt wall and a hold portion provided under the tab main body, the engagement projections are provided over the outer side surface of the skirt wall to be separate from the tab main body, and the stoppers and the engagement projections are formed to be fittable with each other. a cap top surface (110, 210, 310), a skirt wall (120, 220, 320) extending vertically downward from a circumferential edge of the cap top surface; an engagement rib (122, 222, 322) formed along an inner side surface of the skirt wall; and a restraining band (130, 230) tightening the skirt wall, the plugging-type resin cap being characterized by: a tab (140, 240) and engagement projections (151, 251), wherein the restraining band has an arcuate restraining portion, stoppers, and an upwardly projecting portion, the stoppers are formed to extend radially outward from circumferential both ends of the restraining portion, the upwardly projecting portion has two projecting pieces formed to extend upward from the circumferential both ends of the restraining portion and a joint joining the two projecting pieces together, the tab has a tab main body formed over an outer side surface of the skirt wall and a hold portion provided under the tab main body, the engagement projections are provided over the outer side surface of the skirt wall to be separate from the tab main body, and the stoppers and the engagement projections are formed to be fittable with each other. a tab (140, 240) and engagement projections (151, 251), wherein the restraining band has an arcuate restraining portion, stoppers, and an upwardly projecting portion, the stoppers are formed to extend radially outward from circumferential both ends of the restraining portion, the upwardly projecting portion has two projecting pieces formed to extend upward from the circumferential both ends of the restraining portion and a joint joining the two projecting pieces together, the tab has a tab main body formed over an outer side surface of the skirt wall and a hold portion provided under the tab main body, the engagement projections are provided over the outer side surface of the skirt wall to be separate from the tab main body, and the stoppers and the engagement projections are formed to be fittable with each other.