A seal tape (10A; 10B) for closing, from the outside, a plurality of gas discharge ports formed in a housing of a gas generator for a restraining apparatus, the seal tape (10A; 10B) comprising: a plurality of rupture portions for forming a plurality of door portions that open the gas discharge ports by opening when a pressure is applied in a thickness direction of the seal tape (10A; 10B); a fixing support portion for forming, together with the plurality of rupture portions, the plurality of door portions, the fixing support portion remaining attached to the housing when a pressure is applied in the thickness direction; characterized by the plurality of rupture portions being formed by a combination of a plurality of linear fragile portions extending linearly from one side to the other side in a width direction of the seal tape (10A; 10B) with a distance in a longitudinal direction of the seal tape (10A; 10B), and rupture blocking portions (14; 18) for blocking propagation of rupture at a tip of each of the plurality of linear fragile portions; the fixing support portion being a band- like portion that is continuous in the longitudinal direction and has a predetermined width from a side, in the width direction, where the rupture blocking portions (14; 18) are formed; the plurality of door portions corresponding to a region bounded by the rupture portions and the fixing support portion; and an arrangement of the plurality of door portions being adjusted such that the plurality of gas discharge ports are closed from the outside by the seal tape (10A; 10B), and the gas discharge ports are entirely open in a case where the door portions are opened. a plurality of rupture portions for forming a plurality of door portions that open the gas discharge ports by opening when a pressure is applied in a thickness direction of the seal tape (10A; 10B); a fixing support portion for forming, together with the plurality of rupture portions, the plurality of door portions, the fixing support portion remaining attached to the housing when a pressure is applied in the thickness direction; characterized by the plurality of rupture portions being formed by a combination of a plurality of linear fragile portions extending linearly from one side to the other side in a width direction of the seal tape (10A; 10B) with a distance in a longitudinal direction of the seal tape (10A; 10B), and rupture blocking portions (14; 18) for blocking propagation of rupture at a tip of each of the plurality of linear fragile portions; a plurality of linear fragile portions extending linearly from one side to the other side in a width direction of the seal tape (10A; 10B) with a distance in a longitudinal direction of the seal tape (10A; 10B), and rupture blocking portions (14; 18) for blocking propagation of rupture at a tip of each of the plurality of linear fragile portions; the fixing support portion being a band- like portion that is continuous in the longitudinal direction and has a predetermined width from a side, in the width direction, where the rupture blocking portions (14; 18) are formed; the plurality of door portions corresponding to a region bounded by the rupture portions and the fixing support portion; and an arrangement of the plurality of door portions being adjusted such that the plurality of gas discharge ports are closed from the outside by the seal tape (10A; 10B), and the gas discharge ports are entirely open in a case where the door portions are opened.